3TrainerPoké's sprite, like those of most glitch Pokémon, is composed of scrambled bits of data. Its color palette consists of yellow, red, white,black and some green.
3TrainerPoké's glitch effects are limited and generally do no severe damage. It does retain the oddities common to many glitch Pokémon, including instant corruption of a player's Hall of Fame. It also evolves oddly; at level one, it can evolve into Kangaskhan, and at level 128, it can evolve into a Clefairy. It is hard to actually witness these evolutions, however, due to 3TrainerPoké's stats and level change at random.
Barring the use of cheat devices, 3TrainerPoké can only be obtained by trading an 'M from Pokémon Red or Blue. This is because its hex identifier is 00; no unaltered Pokémon can have a Special stat of 0 (rendering the Mew Glitch useless here) and no text character has a character code of 0 (rendering the Old Man trick useless here).
3TrainerPoké's Pokédex number is used by Togetic in later generations.