>>45357036>FrLgThe other protagonist is one of Oak's aides. Instead of random scientists handing out the HMs and items for pokedex completion, it would be them. For certain items, instead of checking pokedex completion you would battle them, with them having the 3rd starter and two of Vileplume/Ninetales/Cloyster. After you become the champion they'll trade you the 3rd starter for the one you took.[Charmander for a Squirtle, etc.]
>CrystalLiterally just have them do what Lyra/Ethan does in HGSS.
>RSEORASJust have Wally show up for battles slightly more often.
>DPPtHave them show up more often, with occasional battles.
>BWThey're another gym challenger. You fight them a few times, including a final rematch just before the E4.
>BW2They're a member of old Team Plasma. They help you in a new segment where you sneak into a Team Plasma meeting to Spy on them.
>XYRemove Trevor and Tierno and have every time you meet them be replaced with Shauna and the rival.
>SMThey're also doing the island challenge. They'll occasionally be in the area when you're doing a trial, and be one of the Title Defense challengers.
>USMThey're a member of the Ultra Recon Squad, rescued from a world ravaged by Necrozma. They'll break off from the group and spend time relearning how to live in the normal world. After a short sidequest in the postgame you learn that they were in your position in another world, but their world was ravaged by Ultra Necrozma before they could stop it.
>SwShThey're a fan of yours that you can interact with after each gym battle. They'll give you gifts, including TRs, and can join you in Max Raids. They'd also visit your camp occasionally.