Why wont random matchup let me play?

I am trying to play in Random Matchup but it says “There was a problem with your Pokemon, and they could not participate.” then it disconnects from Wi-Fi. my Pokemon that I am trying to use is:Gallade Lv.100 PokerusSwampert Lv.100 also has Gift RibbonSalamence Lv.100 (Shiny)Garchomp Lv.100 (Shiny)None of them have Sky Drop or Dark VoidNone of my Pokemon have the same item and I got Salamence and Swampert from trade and Garchomp and Gallade on the GTS.Please help me as fast as you can because I’m trying to enter a tournament that is in 3 days.

I just tried out random matchup without my Swampert and replaced it with a Yanma and it worked so it must be the Swampert, but why?

Pleaselog inorregisterto add a comment.

EitherSalamenceorSwampertwere probably Illegally obtained and Traded to you. To check, Download and usethisPokemon Legitimacy Checker Program by Project Pokemon to check.

Note:The suggested Program has not been tested for Accuracy or safety by myself; Download and Use at your own risk(I’m pretty sure it’s fine though)

Well, first of all do they hold the same items? For example Swampert and Salamence holds leftovers.

If not. You may have hacked your Pokemon with a Cheating device or a site such as PokEdit.

[EDIT] What is the Swamperts “Met at lv ?” it has to be 5 or 1 otherwise it is hackedWhere did the original trainer get it?

///Jofly