Question

Who is the Mega Swampert Trainer in Anime?

Comments

The only one I remember is May's. Is there a different one?

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Could you elaborate? Do you mean in the actual anime, the Mega Evolution specials, or something else?

Answer 1

Currently, in the anime, there is no trainer that has a Mega Swampert, and as far as I know, the only place that Mega Swampert has appeared in the anime is Mega Evolution Special II. However, in the Pokemon Omega Ruby and Pokemon Alpha Sapphire Animated Trailer, May owns a Mega Swampert.

Hope this helps!

Sources: This, and this