ash&charizardfan
Humans are tools
It's worth noting that the Japanese language doesn't have plurals the same way the English language does. So, there could very well be more than one battle in this episode. Or there could be one battle--either a double battle (Ash vs. Misty and Brock) or a free for all. It's a little hard to tell for sure.
If this is similar to tate and liza battle I am pretty sure ash will win it, since they have to market z moves and what way to market it by giving some victories over mega evolution, game freak's previous darling. Besides what new move will be see this time instead of thunder armor will it be rock armor, fire armor, grass armor or wil thunder armor return again.