In the past they have mentioned that attacks like Iron Defence and sword dance effect the pokemons defence and attack after use. But not dirtectly.
Stats and levels are both totally diffrent concepts than the games.
they do mention way back when with the Lt. Surge fight that although Raichu was powerful, Pikachu was quicker and was able to land more hits (or something like that). Plus way back when we had the episode, "School of Hard Knocks" which is the only episode to talk about pokemon levels and such.