ZitatA Pokemon is uber if, in common battle conditions, it can consistently set up a situation in which it makes it substantially easier for other Pokemon to sweep.
Mega Gengar is the perfect example of this. It is not broken solely because of its offensive stats. It is broken because the combination of Shadow Tag, its great defensive typing, its great offensive stats, and its huge movepool allows you to, with almost absolute certainty, remove one or multiple checks to your team with Mega Gengar. We feel that this near 100% probability against all Pokemon (except Ghost-types) is uncompetitive, as Pokemon battles are (and for the most part, should be) a 2-way street in terms of decisions; this Pokemon makes the battle a 1-way street against nearly all Pokemon.
Das ist was Smogon dazu sagt. Also ein Mega-Gengar alleine ist nicht zu stark aber es Supportet die anderen zu stark. Ich hoffe du kannst englisch ;)