Glitch City Laboratories closed on 1 September 2020 (announcement). This is an archived copy of a thread from Glitch City Laboratories Forums.
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You can trade them though, correct? Doesn't the error trap only block glitch PkMn?
I don't think competitive glitch battling is all that commonplace. However, I'm aware that there is no known way to up a G/S/C Pokemon's level above 100, so the only place you'd see a L255 Pokemon is in an R/B/Y battle, and I'm not sure how many of those take place anymore.
I believe the accepted max is 100; I'd imagine a normal R/B/Y player would get pissy if you brought in a L101+ Pokemon during link battle.
Couldn't you do the glitch Rhydon thing, or would the needed data not be carried over to GSC?
No, you can't. I know and I've tried. It says the Pokemon is abnormal. Once it goes back to level 100, it will let you trade it.