SGX has Emerald, not Sapphy. lol
Seedot isn't in Sapphire. He's in Ruby and rarely in Emerald. Crobat is evolved from a Golbat who loves you, and the lottery is hard, just like in real life.
If you catch a Zubat early in the game, like I did at Mt.Moon in FireRed, it could evolve somewhere in the early 30s.