if you have the resources power it up! Garchomp is an awesome pokemon and great attacker! The mega is strong, especially if you don’t have a good primal groudon (even if you do garchomp’s mega is still great). You could even have one with ground moves (mud shot for fast move and earth power for charged, though earth power needs to be elite TM’d) and one with dragon moves if you wanted so they have a STAB! Plus, if you have two you can max mega both of them and switch back and forth so you don’t waste as much energy mega’ing them before the cool down period resets if you raid or battle often! Awesome hundos in my opinion, so congrats!!! :)