A: No. The codebase is different. Trading between 9.1.0 and 8.6 will corrupt your save file.
: Effort Values (EVs) are now capped at 252 for optimization, and the Pokémon status screen highlights stats affected by Natures—red for enhanced and blue for weakened. Difficulty Curve pokemon glazed 910 exclusive
was added. Because of this, the starters that previously appeared in Forlorn Cape were replaced by Pseudo-Legendary Updated Mechanics Gen VII Standards pokemon glazed 910 exclusive