ShadowGuard
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Well, that's true and should be the first thing you do, but there are situations were it isn't possible.maybe the better discussion topic would be why would a player NOT call a judge when a situation like you describe in the OP occurs?
i hear/read this all the time, it seems: this happened, so-and-so is 'known' to be a cheater...but nobody wants to call a judge over at the time the problem(s) happens!
sure, you 'handled it' yourself THIS time...but that doesn't get the bad habit corrected, nor a pattern of issues with a particular player tracked with either the judges or P!P, who could actually DO something about it..
'mom
a) if you realize later you have been cheated - happened to me at Prague Cup 2010 were my opponent used a card to counter me that I later found out wasn't in his decklist
b) if the judges are either not well trained or even biased and just can't or don't want to do anything
In general, it is true and a player should at least contact a judge after the match if his opponent acted suspicious. That wouldn't help him win the match but give the judges a hint to watch him without warning the player, and also without making the thing public (since it could be just an error).
But to come back to the thread, what I mentioned above is the only time where I'm certain my opponent cheated. Fortunately, cheating isn't such a big issue in Pokémon as it is in YGO or Magic. And, we have a really good judge at most big tournaments in my region who is also head judge at our nationals.