Is Arceus any good? (Speaking specifically about WIFI battles

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Mewtwo (Rain Dance / Psychic / Psystrike / Future Sight
Charizard (Flamethrower / Flare Blitz/ Fly / Roost),
Wailord (Surf / Hydro Pump / Blizzard / Rest),
Machamp (Low Kick / Dynamic Punch / Cross Chop / Attract),
Xerneas (Ingrain / Light Screen / Reflect / Double Team),
Victreebel (Solar Beam / Leaf Storm / Infestation / Swagger)

I bolded things that are a problem, and italicized things that are either redundant or could wind up being a problem. I'll talk about why things are a problem, and I'll probably wind up with ideas on how to fix them tomorrow because it's a bit late haha. I'm also simply talking about move sets at the moment, because other things require too much thought that I can produce this late at night. But on to explanations

Mewtwo
•The first problem is rain dance. It's not really helping your team out. Wailord isn't going to be putting a dent into anything, even with the rain. Well, unless you're using Water Spout, but Wailord is so squishy and slow it's hard to get it to work. Rain is detrimental to Charizard and while the rain may help Victreebel against fire types, Solar Beam is gone and Chlorophyll doesn't work in the rain. The move slot could be better used for coverage, I'll think of something to replace it tomorrow. Of you want to use Mewtwo to set weather (please don't) Sunny Day would fit better with your team. But if you want Sun that badly, Groudon or Chari Y would be better
•The second problem is Future Sight. Two turn moves are never a good thing, because it give your opponent a free turn to switch in something that can take it or set up on you.
•You're going to have to choose between Psychic and Psystrike. Mewtwo can learn a lot of different moves for coverage, you don't need two psychic moves. It depends on your ratio of special to physical attackers. If you already have a lot of special attackers, use Psystrike. If the opposite, go psychic (although the better change would to be have a more even amount of physical/special attackers honestly

Charizard
• Fly has the same problem as Future Sight, except you're also fully committed to the move the next turn. That's even worse.
•I'd suggest using a Mega. Y would do well with Victreebel, seeing as how the Sun activates Chlorophyll. X would give the team some physical coverage, which wouldn't hurt. The ground weakness would hurt a little, considering 1/3 of your team would then be weak to ground. I'll get a bit more in depth later, like I said, it's a bit late haha.
•You'll need to choose between Flamethrower or Flare Blitz. Depends on whether your prefer Y or X. If you don't want to Mega, I would probably go with Flare Blitz. Fire Blast is an option too

Wailord

•He's gotta be holding you back. He can barely take a hit and can't dish one out either. There's so many other options that can go here if you want an offensive water Pokemon. But if you want to use him, scarf Water Spout is the only way. Even then, it'd be pretty difficult.

Machamp
•You don't need three fighting moves. Keep Dynamic Punch and make sure you're using No Guard. The other moves should be for coverage
•Attract is pretty risky. I can see some Attract and confusion shenanigans, but the fact that it has to be against the opposite gender can make the move a wasted slot half of the time.

Xerneas
•Double screens can be useful at times, but that's wasted on Xerneas. Geomancy and Power Herb is killer.
•Double Team can be unreliable. It's essentially a crapshoot, and while it can be devastating it's based on luck. There's always the chance the 6 double teams you just did won't help at all. I'd stick to Geomancy and destruction
•You forgot to put attack moves on it. That's a big part of a Pokemon battle.
•Also, make sure your moves work together. You can't pass dual screens if your Xerneas is ingrained into the ground.

Victreebel
•Pick a reliable grass move. If you know you'll constantly have Sun up, Solar Beam is fine. If not, Giga Drain is best. Leaf Storm won't do anything after the first or second use, and would probably wind up with a dead Victreebel. He's too squishy to use it and expect to stay alive
•Infestation is good for either trapping or residual damage. Victreebel is too fragile for either. Besides, if you want residual damage with Victreebel, Toxic would be a better choice.
•Sludge bomb would be a nice move, considering STAB
•Honestly, Grass isn't exactly the best offensive type.
•Swagger is a double edged sword. Like Double Team, its success is primarily based on luck. You don't want luck. You want consistency. If you want to use Swagger, Id suggest something with Prankster and Foul Play. But Victreebel can't take a +2 attack if your Swagger goes awry




I didn't talk to much about team composition or even move replacements, I'll wind up doing that later if you'd want me to