I'm trying to free battle and it's telling me there is a problem with one of my Pokemon. Can someone help me?

Question

If someone could please enlighten me as to what the problem is with this team I'm trying to battle online with:

Kangaskhan @ Kangashanite
- Protect
- Fake Out
- Return
- Double Edge

Gengar @ Gengarite
- Protect
- Sludge Bomb
- Shadow Ball
- Confuse Ray

Talonflame @Leftovers
- Protect
- Brave Bird
- Overheat
- Tailwind

Salamence
- Protect
- Dragon Dance
- Hyper Voice
- Double edge

Xerneas @ Power Herb
- Protect
- Thunder
- Geomancy
- Moonblast

Comments

Looks fine to me from a first glance. It might help to update it with their stats and abilities.

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The only thing that jumps out at me is the fact that Xerneas is a legendary, but that's only relevant to specific formats, which the term "free play" would not correlate to.  This would likely indicate that you have an illegal move or ability on one of you Pokemon, resulting from hacking by either you, or someone else through the ancestor of one of your Pokemon, obtained through a trade.  I don't see any illegal move combinations though.  Can't say for Abilities as you did not list them.

Are you only using 5?  And what is Salamance's item?

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According to the above commenters, your Pokemon seem legal (I don't know what your battling on sigh) so I imagine the fault is not in our stars, but in your Pokemon's stats. There are legality checkers around the internet that check whether your Pokemon are legal, you should shove your Pokemon in there.

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One or more might need to be shiny...

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is mega kangaskhan legal?

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Why would it not be...

Answer 1

Your team looks legit, this are the only problem I can think of:
If your Pokemon was transfered from any game that isn't 6th gen, it's illegal to use. Also you didn't put that your salamence had an item, so if you forgot to put what it was just remember you can't have the same item or soul dew (but I don't know why you would put that on your salemence).