Okay, game's back online now.
>>53500883Run it through something like Calcy IV or Pokémon, or put it into an online checker like
https://www.stadiumgaming.gg/rank-checker (linked in OP)
If your Pupitar is under level 15, you have a rank 50 Tyranitar for Great League. Otherwise, it's a rank 12 Pupitar for Great League but that's not really worthwhile.
Ultimately though, Ttar is a master league pick because it's attack focused.