Trump Card is learned by 4 species by level and 6 by egg

Effect, in PokéAPI's words

“Power increases when this move has less PP, up to a maximum of 200.”

Who learns it

10 species in all, 8 of 9 games shown

Ultra Sun and Ultra Moon: 10 species

Species	Method	Level
Minun	Level up	40
Eevee	Level up	45
Slowking	Level up	49
Magearna	Level up	97
Farfetch’d	Egg
Kangaskhan	Egg
Dunsparce	Egg
Corphish	Egg
Shellos	Egg
Oshawott	Egg

Sun and Moon: 10 species

Species	Method	Level
Minun	Level up	40
Eevee	Level up	45
Slowking	Level up	49
Magearna	Level up	97
Farfetch’d	Egg
Kangaskhan	Egg
Dunsparce	Egg
Corphish	Egg
Shellos	Egg
Oshawott	Egg

Omega Ruby and Alpha Sapphire: 9 species

Species	Method	Level
Minun	Level up	40
Eevee	Level up	45
Slowking	Level up	49
Farfetch’d	Egg
Kangaskhan	Egg
Dunsparce	Egg
Corphish	Egg
Shellos	Egg
Oshawott	Egg

X and Y: 9 species

Species	Method	Level
Eevee	Level up	45
Slowking	Level up	49
Minun	Level up	51
Farfetch’d	Egg
Kangaskhan	Egg
Dunsparce	Egg
Corphish	Egg
Shellos	Egg
Oshawott	Egg

Black 2 and White 2: 9 species

Species	Method	Level
Eevee	Level up	45
Slowking	Level up	49
Minun	Level up	51
Farfetch’d	Egg
Kangaskhan	Egg
Dunsparce	Egg
Corphish	Egg
Shellos	Egg
Oshawott	Egg

Black and White: 9 species

Species	Method	Level
Slowking	Level up	49
Minun	Level up	51
Eevee	Level up	57
Farfetch’d	Egg
Kangaskhan	Egg
Dunsparce	Egg
Corphish	Egg
Shellos	Egg
Oshawott	Egg

HeartGold and SoulSilver: 5 species

Species	Method	Level
Minun	Level up	48
Slowking	Level up	53
Eevee	Level up	57
Dunsparce	Egg
Shellos	Egg

Platinum: 4 species

Species	Method	Level
Minun	Level up	48
Slowking	Level up	53
Eevee	Level up	57
Dunsparce	Egg