*the answer, not my answer LOL
Also:
https://pokemondb.net/pokebase/275054/difference-between-battle-legends-between-battles-normals
I plan on answering this to give it a better answer and am considering adding a trainer lookup tool as a source for which sets Red and Blue can have in the Battle Tree to help point out which sets they have. However, the lookup tool is for Ultra Sun/Moon while the question was asked when USUM wasn't released yet. Should I add the lookup tool for the source anyway and just make a note of the set differences of two of Blue's Pokemon (Rhyperior and Aerodactyl and just say which moves to ignore to have the sets used in Sun/Moon)? Here's the lookup tool for reference (you can search for trainers by their name of from their quote):
https://lookup.eisencalc.com/