how do you get to altering island
You can get there from Five Island keep going right and you'll see water well Surf and go forward and you'll see a little town go there then go to the Forest if you want catch a Heracross and then get out of the Forest and then Surf again and keep going forward and then you'll see a member of Team Rocket beat him and you'll be able to go to Altering Cave.
But its not worth it there's only Zubat except if you do something special or use an E Reader.
Pupitar evolves to Tyranitar at lv. 55. and if you want to get and A.R., try going to places where you get games and stuff the probably have some. they should.
if you need more help, just post them here or you can PM me.
Thanks for Helpin combines