If they are 14~15 Attack, you should be fine. (Assuming they're 96%+). The only thing you have to worry is the weather. In order to solo Tyranitar you need Cloudy weather, and throw as many Dynamic Punches you can. I feel really happy seeing other people want to take the Tier 4's solo challenge. Go for it!!! Good luck!
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Team of Machamps - IV Question
Assuming all six Machamps are maxed out at level 40.
In order to be able to solo Tyranitar, does the ATK IV of all six Machamps HAVE to be 15? Would three 15s and three 14s theoretically achieve it? or would breakpoints be an issue?