>>37543984>Varied team with just enough coverage on the weaknesses/resistance/immunity sides to switch pokemon around relatively "smartly">Team should have perfect IVs, EV investment, and reasonable full movesets>If applicable, uses any non-post-game mechanic already introduced before their encounter (Z-Moves for example), and all Post-Game mechanics (Megas and such) in the rematch>Some degree of involvement in the story, similar to Lance/Steven/Cynthia, though not necessarily another rival like BlueNot that a Rival beating you to the road to Champion is bad, I just dont feel they'll do that angle better than Blue
>Some degree of character. Give us insight to what they think about being Champion and how it shapes their view of the world they live in. If the player provides a shift in mindset or new understanding through their actions, then thats even better.Basically, make them not suck.