To get a Tyranitar, you have to catch a Larvitar on 7 island and make it evolve.
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that depends on the moves, the levels, and the natures.
raikou cannot be caught on Pokemon ruby
No.
You can't catch a sentret in Ruby version, but you can catch one in Emerald version.
you can not catch scyther in Pokemon ruby,emerald or sapphire . you have to trade them from Pokemon fire red or leaf green.