Latios is a Dragon and Psychic type Legendary Pokémon and is a part of the Eon Duo. While Latios may have a lot of weaknesses with it being a dual type, it certainly won’t be a push over as it is very powerful in the attack area due to it being able to know the Grass type move Solar Beam.
There are a lot of potential Pokemon to choose from for your lineup. The types that will be the most effective are Bug, Dark, Dragon, Fairy, Ghost, and Ice types. It’s a good thing we aren’t in short supply of any of these types, because you will want your most powerful to face Latios.
Now that we’ve gotten to a good place in Pokémon GO where this Dragon type is being used for more than defending a gym, you’ll want Dragonite in your lineup no matter what moves Latios throws at you. You’ll want a move set of Dragon Tail and Outrage as they will do the most damage.
The Bug and Steel type Pokémon will be a great addition to your team if Latios’ charged moves are Solar Beam and Psychic. The moves you’ll want Scizor to have are Furry Cutter and X-Scissor as they are the best moves for this Pokémon.
The Gen 1 Psychic type Legendary is a must to have in your lineup and will be best used if Latios is using Dragon Claw or Psychic as its charged move. I’m excited to finally put Mewtwo in a lineup due to how strong it is, and for the fact this is my favorite Legendary Pokémon whom I share a birthday with. The moves you’ll want to have are Psycho Cut and Shadow Ball.
The Dark and Rock type will make another appearance in your lineup due to its Dark type moves and how much damage you can do. You won’t want Tyranitar in your lineup if Latios knows Solar Beam as it will easily take it down. You’ll want Tyranitar to have Bite and Crunch as its moves to do maximum damage.
This Gen 3 Dark type Pokémon may not be able to take a lot of damage, but it will be able to pack a nice punch. Absol is very similar to the Eevee evolution Umbreon when it comes to stats. Snarl and Dark Pulse will be your best moves to have in this situation.