Pokédex category glitch

Miscellaneous glitches of Pokémon Ruby and Sapphire, Pokémon FireRed and LeafGreen and Pokémon Emerald

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

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The Pokédex Species Glitch is a miscellaneous glitch which only exists in early versions of Pokémon Firered and Leafgreen. In the previous Generation III Pokémon games; the Species name for Pokémon were only one word, for example in Pokémon Ruby and Sapphire the Species name for Pidgey was the "Tinybird" Pokémon, instead of the "Tiny Bird" Pokémon. This was because the game engine would ignore any words after spaces so if Pidgey was named the "Tiny Bird" Pokémon, it would appear on the Pokédex as the "Tiny" Pokémon.

An example of a Pidgey affected by the Pokédex Species Glitch, its Species name should actually be the "Tiny Bird" Pokémon.

This is the case for the earlier builds of Pokémon Firered and Leafgreen, since Nintendo decided to give Pidgey its original species name as in Pokémon Red and Blue, a Pokémon's name will be "cut off" to the first word, since Pokémon Firered and Leafgreen almost have the same engine of Pokémon Ruby and Sapphire. If this glitch occurs in a player's Pokémon game he or she can be certain that he or she has version 1.0.