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Let's speculate a bit how the newly revealed Pokémon's playstyle could be from the information we have. It's OK to fill in some gaps in our knowledge with guesses, but try not to go overboard, like inventing completely new abilities and giving them to a Pokémon as its hidden ability.
>Yungoos
It's name and the E3 treehouse footage suggest it will evolve once. With it's abilities of Stakeout and Strong Jaw, an offensive stat distribution of high speed and usable attack would allow for two sets with different purposes: A Strong Jaw set with Hyper Fang and Crunch to use as a revenge killer, and a Stakeout set that can be used to break walls on switch in. This would be especially effective if Yungoos' evo gained the Dark type. The two sets would reinforce each other's effectiveness since one would encourage switching in walls, and one would discourage it.
>Drampa
Normal/Dragon has terrible super effective coverage, but is quite good for neutral hits. It's abilities suggest mixed attacking stats. It could possibly be a serious wall breaker (since it's design suggests a low speed stat), physically with Outrage/Return, specially with Draco Meteor and maybe Boomburst. A Substitute set would probably work well.
>Vikavolt
Appears to be a special attacker, and might possibly quite fast. It remains to be seen what it can offer to differentiate itself from Galvantula. As it stands, Galvantula has Compound Eyes Thunder and Sticky Web, while we only know of Zap Cannon and Levitate for Vikavolt. If it gets No Guard that would be a niche right there, but since Levitate is it's primary and only ability, this seems doubtful. Probably a good Pokémon in game, but maybe not for multiplayer.
>Charjabug
Possibly a good support Pokémon for Doubles if it has some bulk and a good support movepool. Thunder Wave, Wide Guard, Quick Guard and Rage Powder all seem possible. Eviolite might be enough to make it usable.