Oshawott is funny, the starters always seem to rock the show one way or the other. Think about it. Charmander, Squirtle, Bulbasaur, all were epic in one way or the other.
Chikorita (we've already talked about her), Totodile (ended with Ash after an epic battle with Misty), Cyndaquil (one of my personal favorites who also had a great arc).
Torchic (May's first Pokémon, evolved to Blaziken), Mukip (ended up with Brock, was fun), Treecko (Ash's Pokémon, evolved to Sceptile and defeated Darkrai).
Turtwig (Ash again, rocked the full evolution), Chimchar (the true star of the Sinnoh shows with his storyline with Paul), Piplup (kind of like Oshawott but with anger instead of fear).
And now Tepig, Oshawott and Snivy all epic in their own ways. Say what you want about the shows the starters always turn out right.
Guns (like real ones) aren't in the show at all. They believe them too violent to be in a kids show. In fact one episode was banned from airing because a bad guy put a loaded gun in Ash's face. No idea about the Manga.
Those are some classic battles, Pikachu vs Eevee was great caused it showed that Gary still had skills and could beat Ash.
Keep'em coming with the epic battles people! What are your favorites?