Crystal is one of the obvious favorites because of the Battle Tower, easier to aquire Legys and so on. Crystal IS Gold/Silver with added material.
Ps.
The only thing you won't get in Gold is Aeroblast with Lugia and Sacred Fire with Ho-oh in Silver. Unless you have Pokémon stadium
My Lugia on GOLD with Aeroblast, untraded... Wicked...
Crystal's like Gold/Silver, only with various tweaks, which make it a bit better. I really miss not being able to catch Mareep, so having just Crystal wouldn't do...
Having played Silver, Gold and Crystal.. Hm. I think Crystal is my favourite, overall due to the cute little girl sprite. ._. I was pretty dang sick of being a boy. Playing as a girl was one of the main reasons I wanted Crystal!
- extremespeed dratini
- BATON PASS EEVEE
- baton pass scizor
- rock slide or swords dance (can't remember which) marowak
- cross chop electabuzz
- Teh move tutors
- The free egg that has a much greater chance of hatching into a shiny
- Buena's channel
- Animations!
I always liked crystal because it had better animations. It took me two years to find a crystal version but finally found one in Atlanta, Ga. It still cost $30.00
whereas silver and gold cost $9.99 apice.