All three on!
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Actually its 3,,2,1 and u get it all unlocked
You get it from Bill in Goldenrod city (his house is south-west of the Game Corner), but you have to talk to him in the Ecruteak Pokemon Center in order for him to be there.
Yes, Scyther will evolve in Pokémon Crystal however it needs to be holding the Metal Coat while you're trading it in order for it to evolve.
You will need to use a Fire Stone on Growlithe in order for it to evolve, it will evolve into Arcanine.
underneath of goldenrod city, in the switches basement *spoiler alert* during the part where you are trying to get into the radio tower and take it back from team rocket. Not sure which switches you push and what order to get it. Something I read said it was 3rd (farthest on left), 2nd, 1st, but this does not work in my version.