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Mega Latios is here! It already shows up occasionally on top counter charts, and as a Mega it’s going to have some play. It’s my first perfect legendary, so mine will get even more use as a Mega. I don’t see it playing out in PvP, but still need to get that XL and shiny hunt, and enough mega candy to evolve the first time.
What to use? Dragon on dragon damage happening here, you can use the Mega Latios on itself for that cruel twist. Mega Gengar and Houndoom are also right up there, but if your fellow trainers are using dragons, a Mega Latios or Latias will help even more while it lasts.
Go to the official counters page for a complete list, including shadows and megas to see how your Pokémon perform.