In Pokmon Soul Silver, you need to get Larvitar first. ( Lv. 15-17 at Safari Zone, in Mountain Top Zone ), or in Mount Silver (Lv. 20ish).
You level Larvitar up, it evolves into Pupitar at Lv. 30, and Tyranitar at Lv. 55.
I have a Lv. 52 Pupitar, and its stats are decent. But it has a higher Special Attack than attack so I'd recommend teaching him Dark Pulse, (a move learned as he levels up).
Chat with our AI personalities
First it's larvitar then it's pupitar and then it's Tyranitar
get rid of sheildon luxio magikarp and ponyanta and replace them with metagross zapdose tyranatar scizzor and machamp