I've played a few that tried stuff to make lesser-used Pokemon more viable.
Pokemon Rejuvenation uses Crests, held items for a given species:
https://rejuvenation.wiki.gg/wiki/Crests
Some are garbage ("Darmanitan is forced into Zen Mode while holding this crest"), some are solid or interesting changes (Luxray, "STAB on Dark moves and gains Dark-type resistances. Normal type moves are Galvanized"), some are absolutely fucking broken ("Ledian punches four times at once [any punching move becomes a 4-attack multi-hit]. Secondary effects only occur on the first two hits"). So Power-Up Punch is a Swords Dance that also hits four times.
They even have one for Luvdisc:
The Base Power of all damaging moves matches Luvdisc's happiness, capping at a Base Power of 250.