Not really. Steelix still requires a Metal Coat, and since there's no way to raise a pokemon's beauty in Reborn...
:I
You said probably though, so yeah
The "script is taking too long" can happen in a variety of places. Why it happens, well... Ame probably said it somewhere and i forgot.
But yeah, always save everywhere and create lots of backups for your saves just in case it explodes.
Also, let me ask something: Do you happen to have a lot of pokemons in one box? Like, lot of boxes full of pokemons?
Normally i don't adress bugs here, but i'll make an exception.