Roaming Pokémon Roar glitch
Exclusive to Ruby and Sapphire:
256x item selling price glitch | Amazing Trainers | Berry glitch | Draining hitpoints animation glitch | Evolution animation glitch | Sticky Hold glitch | Mossdeep City Skitty glitch | Truck glitch | Nightmare glitch | Mossdeep City Skitty glitch
Acro Bike instability glitches (Japanese only) | Dark red selector glitch (International only) | Excessive doll arrangement glitch (Japanese only) | Mail and Trick glitches (Japanese only) | Surf on land (Japanese only)
Exclusive to FireRed and LeafGreen:
Celadon City origin glitch | Pokédex species glitch | Roaming Pokémon Roar glitch
Exclusive to Emerald:
Battle Pike poison knockout glitch | Black curtains glitch | Mart worker glitch | Mover Vigoroth cry glitch (Japanese only)
In various or all entries:
Azurill gender glitch | Boss HP recruit glitch (Mystery Dungeon) | Decamark-specific glitches | Dewford Gym footprint glitch | Evolution move-learning glitch | Focus Punch glitch | Roaming Pokémon IV glitch | Sky Pillar glitch | Thunderbolt glitch | VBlank RNG interrupt glitch
| Bulbapedia also has an article about Roaming Pokémon Roar glitch. |
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Reason given: Check if this occurs in Japanese Pokémon Ruby and Sapphire with the Latias and Latios glitch. |
The Roaming Pokémon Roar glitch (not to be confused with the Roaming Pokémon IV glitch) is a relatively minor glitch that occurs with the Roaming Legendary Beasts in Pokémon FireRed and LeafGreen.
Usually when one of the Legendary Beasts flees, it should still be available but may have moved to a different route.
However, if one of the Legendary Beasts uses Roar it will cause the Pokémon to become unavailable.