Sizor is a steel type pokemon so any fire, ground or fighting moves will be very effective. just get a pokemon that knows a powerful fire, ground or fighting type move and it should take down Sizor quite quickly.
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kill all her pokemon.
you fight it and defeat it w/ ur Pokemon
go to the Pokemon league and defeat them
go to end of distortion world and talk to him
Its a Pokemon Searcher that finds hoenn or johto Pokemon after you defeat the elite 4 and talk to Prof.Oak.