Lucario does not fight whatsoever similar in the games compared to the anime. The aura ability has zero gameplay factors in Pokemon itself. It's a pure anime thing, which makes sense, as he was based upon his movie appearance with a martial art stuff.
Ash-Greninja isn't a Mega Evolution whatsoever. It's actually an inherent skill. Never mind that it works entirely differently and is an actual unique Ability when translated to the Pokemon games. It's 100% an anime thing. Reality is, every Smash game takes from the anime or directly references it in some way. Now, it is possible that he only added Ash-Greninja due to it making its first game appearance(again, it's an Ability in Pokemon, not a Mega Evolution. It's like the form change, more specifically) in the ORAS demo, but the fact Greninja uses his anime kunai instead of his water swords is a strict anime reference anyway. ...Besides that, Ash-Greninja came from the anime entirely, so the fact it has an ORAS appearance before Ultimate doesn't much matter. These are all strict anime first factors. Sakurai has made it clear he looks at the anime for Pokemon sometimes. He takes from it quite often. Many Pokemon had the anime as part of why they got in(Jigglypuff, partially what helped Pichu due to the movie factor, very specifically Lucario, who was chosen from the Pokemon movie, not from the games in any way. PIkachu, Charizard, and Mewtwo had it as a partial factor, as it helped determine some of their movesets. Rest, not so much. They're generally more game-related instead).