One: there is indeed a Book of Regional Records, but players' Pokemon cannot rank in it! Based on the anime and games alone, the size of Pokemon varies TREMENDOUSLY--from absolutely massive to incredibly tiny! No matter how big or little your Pokemon is, you can be pretty sure there exists at least one out there even bigger or smaller or longer or wider!

Two: ....human food has always been edible to Pokemon, so a human-safe poffin would be edible for Pokemon!