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- (Generation I move)
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Major glitches of the Pokémon series

Arbitrary code execution (template) | 2x2 block encounter glitches (Left-facing shore tile glitch (in-game trade shore encounter trick, old man trick, Trade link up shore encounter trick, Fight Safari Zone Pokémon trick)) | Berry glitch | Bad clone glitch (Celebi trick, Celebi Egg trick, Shiny Celebi trick, ????? map corruption, glitch move map corruption, overloaded party map corruption, Glitch Unown (Glitch Unown map corruption), duplicate key items glitch (TM/HMs outside of the TM/HM pocket, Glitch Pokédex categories)) | Bug-Catching Contest data copy glitch (Japan only) | Cloning | Elite Four door glitch (Japan only) | Expanded item pack (Custom map script pointers, Glitch Rocket HQ maps, Map 254 (Yellow), Text pointer manipulation (item ball manipulation, mart buffer overflow), Trainerless instant encounter glitch) | Glitch City (Safari Zone exit glitch, RAM Manipulation) | Infinite Master Balls (Colosseum) | Large storage box byte shift glitch (remaining HP glitch, maximum stat glitch) | Mimic glitch (Japan only) | Lumiose City save glitch | Pikachu off-screen glitch (Trainer corruption glitch) | Pokémon merge glitch | Pomeg glitch (Pomeg corruption glitch) | Roaming Pokémon encounter glitch (Japan only) | (Mimic) Transform Rage glitch | Select glitches (Japan only) (Closed menu: Dokokashira door glitch (international), Fossil conversion glitch (international), Second type glitch, Skip to Level 100 glitch, Trainer mutation glitch, walk through walls (international) Special menu: Lift glitch, Badge describer glitch) | Sketch glitch | SRAM glitch (255 Pokémon glitch, send party Pokémon to a new game) | Surf down glitch (Grass/rock Surfing glitch (Spanish/Italian only)) | Time Capsule exploit | Trainer House glitches | Tweaking | Trainer escape glitch (Death-warp, Mew Trick, Ditto Trick) | Buffer overflow techniques (Japanese unterminated name glitch item instant encounter glitch, LOL glitch, Rival LOL glitch, oobLG, blockoobLG, Instant encounter infinite chain glitch (LGFly)), Super Glitch (Generation I), Text pointer manipulation mart buffer overflow glitch, CoolTrainer♀-type move, Yami Shop glitch) | Walk through walls (ledge method, museum guy method, Rival's effect, Select glitch method (international), Brock Through Walls) | ZZAZZ glitch (party Pokémon box data shift glitch)

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Bulbapedia also has an article about - (Generation I move).
File:CoolTrainer6.png
Viewing '-' on the Fight screen.

"-", nicknamed "CoolTrainer move", is a 'move' with an index number of hex:00 in Pokémon Red, Blue, Yellow. It is considered a glitch move when it is the first move in a Pokémon's list of moves. The name "CoolTrainer move" was taken from the name of its (probably constant) type; "CoolTrainer♀" in Pokémon Red and Blue for when no Semi-Super Glitch effect is caused.

On the Fight screen and a Pokémon's summary it is called '-', because this name is used for no move (also hex:00) in situations where a Pokémon knows less than four moves, but it acts as a glitch move when it's forced as the first move.

Upon using it, and when a PP Up is applied to it, its name is taken from the memory and is essentially random.

Obtaining '-' as the first move

In Pokémon Red and Blue, the swapping Transform moves glitch can be used to put '-' in the first position of the moves list if the number of moves after the transformation is greater than the number of moves before the transformation.

Example 1: Ditto normally only knows Transform, so if it transforms into a Pokémon with four moves, swapping the second move with the first will make it have CoolTrainer♀ as the first move after the battle.

Example 2: A Mew knowing only three moves including Transform can encounter a Pokémon with four moves and transform into it. Then, swapping the fourth move with the first move will give CoolTrainer♀ as the first move after the battle.

The swapping Transform moves glitch was fixed in Pokémon Yellow, however, the player can still trade a Pokémon with an accessible '-' over from Pokémon Red and Blue.

Certain glitch Pokémon know the CoolTrainer♀ move as their first starting move, and many can learn the CoolTrainer♀ move through level up, meaning that the first move can be replaced with it if the Pokémon already has four moves.

Theoretically arbitrary code execution can be used to obtain '-' as the first move, too.

0 initial PP and how to restore it

After obtaining '-' as the first move it may have 0/13 PP at first, and healing at a Pokémon Center won't restore its PP. However, if the player uses a certain PP restoring item (Ether or Max Ether only), it's possible to use the move.

Glitch Pokémon that know '-' as their first move

In Pokémon Red/Blue only

#250 family:

#000 family:

  • Fossil and Ghost Missingno. only, if one of the Pokémon above is the last Pokémon in the party, and the Pokémon screen is opened before capturing it. (hex:B6-B8)

Glitch Pokémon that know '-' through level up

Note that this data was generated from the ROM, and has not been verified.

In Pokémon Red/Blue

Glitch Pokémon Index number (dec) Level(s) it learns '-'
▶ A (hex:BF) 191 248
ゥ (hex:C1) 193 33
. 4 (hex:C2) 194 97, 123
POKéWTRAINER (hex:C4) 196 139
♀pゥ ゥ ゥ (hex:C7) 199 115, 219
PC 4S H (hex:CA) 202 28, 62
TRAINER (hex:CD) 205 181
W G d (hex:CE) 206 248
O PkMn4 X (hex:CF) 207 33
PkMn PkMn T (hex:D0) 208 22
4B 8 4 8 (hex:D1) 209 165
M p' u ゥ (hex:D3) 211 234
pゥ ゥ ゥ (hex:D5) 213 12, 13, 115, 131, 137
4 h (hex:D6) 214 4
PkMnRPkMn B (hex:D9) 217 6, 11
B (hex:DA) 218 3
(hex:DC) 220 3
7 PkMn 'v (hex:DD) 221 12, 13, 115, 131, 137
'v (hex:E1) 225 234
...... (hex:E2) 226 248
(hex:E4) 228 4, 33
C (hex:E5) 229 248
(hex:E6) 230 4
pゥ (hex:E7) 231 234
c (hex:E9) 233 3
(hex:EB) 235 38
h ゥ (hex:ED) 237 248
g (hex:EE) 238 33
94 (hex:F1) 241 12, 22
ゥ (hex:F2) 242 192, 248
ゥ (hex:F3) 243 28, 62
G 'Mp (hex:F6) 246 240
' N g ゥ (hex:F8) 248 12, 13, 115, 131, 137
94 h (hex:F9) 249 38
(hex:FA) 250 6, 22
O (hex:FC) 252 234
6ゥ (hex:FD) 253 248
'M (hex:FE) 254 3, 7, 15, 31, 63, 127, 255
'M (hex:FF) 255 28, 62

In Pokémon Yellow

Glitch Pokémon Index number (dec) Level(s) it learns '-'
4A 4 (hex:BF) 191 234
♀ . (hex:C1) 193 16, 22
(hex:C8) 200 7, 15, 30, 31, 127, 255
PkMn (hex:CE) 206 234
(hex:D0) 208 16, 22
(hex:D4) 212 22
' ゥ. (hex:D5) 213 12, 13, 51, 87, 115, 131, 137
PkMn (hex:D6) 214 4
(hex:D7) 215 97, 123
(hex:D8) 216 22
ゥ ' B (hex:DB) 219 16
4, ゥァ (hex:DD) 221 12, 13, 51, 87, 115, 131, 137
4 89 4 (hex:E3) 227 7, 15, 30, 31, 127, 255
8B 4 8 (hex:E4) 228 4, 33
Z ゥ (hex:E5) 229 234
9ゥ (hex:E6) 230 4
'r ゥ (hex:EA) 234 8
4 ( h 4 ?? (hex:ED) 237 234
h pゥ ゥ... (hex:EF) 239 3, 7, 15, 31, 63, 127, 255
' B' ゥ (hex:F1) 241 12, 22
ゥ A (hex:F3) 243 28, 62
ゥ (hex:F8) 248 12, 13, 51, 87, 115, 131, 137
Q (hex:FF) 255 234

Semi-Super Glitch effect

Screen tiles affecting Pokémon, DV/EV, level yields by Dabomstew.

See also: Section on the Super Glitch article.

An effect similar to Super Glitch may be triggered with '-' when it is the first move by opening the fight menu or trying to move the cursor. After the effect occurs, the type of '-' may change from CoolTrainer♀ to another type.

Unlike other unterminated name/Super Glitch moves, only one buffer overflow occurs with '-' (at memory address $CF4B, but not $D0E1). No corruption is caused by the '-' move when viewing it from a status screen.

Triggering the Semi-Super Glitch with '-' requires more luck than other Super Glitch moves, so the player may need to keep 'moving' the cursor or opening and closing the fight menu. After a certain point in the player's game, CoolTrainer♀ induced corruption may stop working, due to hex:50 characters appearing in its internal name too early. There is no known guaranteed way to fix this other than to use a different cartridge.

The most basic effect that can be triggered with the CoolTrainer♀ move is the TMTRAINER effect, by opening the 'PkMn' menu from within battle before viewing it in the 'Fight' menu. Triggering the TMTRAINER effect in Diglett's Cave will let you avoid a freeze immediately after the battle ends. Opening the start menu after the TMTRAINER effect happens and the battle ends may be required to avoid a freeze after exiting the cave.

With the TMTRAINER effect, the enemy Pokémon's species will change into a level 127 Missingno. (hex:32) if sprites are not flipped, and a level 127 Horsea is obtainable by catching the enemy Pokémon if the sprites are flipped. Though the Pokémon's sprite will not change to the new Pokémon until it is captured, its palette may change to that of the new Pokémon.

In Pokémon Red and Blue, more Pokémon can be obtained with '-' (and also Super Glitch) by viewing the Pokémon menu in specific places where there is a 'bottom-left corner of a bush' tile (hex:50) between y coordinates 09-0C (these are BGB coordinates; y starts as 00 at the top of the screen and increases the further down you go) before entering Diglett's Cave and triggering Semi-Super Glitch with '-'.

For an image showing where the bush tiles should be, and further information, please see this Youtube video by TheZZAZZGlitch.

Keep in mind that the start menu is added to the saved screen data, and the west most tiles of the start menu are between x=0A-13, so the 50 tiles replaced with start menu tiles don't count.

Effect of using the move

This effect ignores Semi-Super Glitch:

In Pokémon Red and Blue and Yellow, '-' acts as a damaging move with Fissure's animation that may freeze the game if it doesn't defeat the opponent.

In Pokémon Red and Blue, the effect of the move (move effect 0x74) executes arbitrary code at F928 (Echo RAM for D928). For more information on how to exploit this, see here.

Note

A Pokémon with '-' as the first move can be traded to Pokémon Gold, Silver and Pokémon Crystal, where it will become - (Generation II move), because a Pokémon is not deemed 'abnormal' by its moves.