I'm tempted to go with Lugia for the moment. I simply love her and even though people say she's not worth it I think her low attack stat is made up a little by her high-dps moves (everyone uses Vaporeon who has an attack stat of 205 vs 193 for Lugia and ES is far better than WG. Snorlax has 190 and is used by many as a tank). Lugia also adds a new dimension to my psychic lineup, which are all glass cannons in soloing Machamp.
After that I'm thinking about Zapdos. He's a little better than Jolteon in every aspect but his quick move. He's also equal to Raikou from comparing the stats, but Raikou has better moves. Still we don't know when the beasts will be released and electrics are pretty much irrelevant in the current meta.
Further thinking I would go with Entei from the dogs since he's a clear upgrade to Flareon and much better than Moltres in my book. Ho-oh will be a no brainer even though his moves are a bit shaky, but having a 4k mon is just to tempting and SW/Brave Bird will be sick as a generalist.
