This is my list of Pokemon that should have gotten a move added to their movepool, when certain Pokemon got an extra move, so here we go.
Espeon: Psycho Cut, Shadow Ball. Reason: Espeon has been stuck with of moveset that is all Psychic type (except last resort) so Shadow Ball might have help it get some type coverage and Psycho Cut would make it a bit better, since ZH is kinda bad, and Confusion is good, just slow.
Flareon: Solar Beam. Reason: same as Espeon, just type coverage.
Vaporeon: Dragon Tail, Thunderbolt. Reason: Dragon Tail is for neutral damage towards its weaknesses, Thunderbolt is for fighting other Water types.
Charizard: Dragon Breath/Tail, Sky Attack. Reason: Sky Attack is for making it a better Flying type attacker, the Dragon type fast moves is for making it a better dragon type attacker.
Hitmonchan: Dynamic Punch. Reason: Hitmonchan is quite a decent Pokemon, and DP will make it a way better fighting type attacker.
Venusaur: Poison Jab. Reason: Its moveset is mostly based around the Grass typing, and this will make it a better poison type attacker.
Gengar: Acid. Reason: same as Venusaur, i want it to be a better Poison type attacker.
Add any Pokemon and the moves you want added to their movepool down below, cya!