In formats like Explorer where you can have more than one copy of a given card, you can have Tergrid plus the other side of the card (Tergrid's Lantern) in play at the same time, and thats a nasty combo
You cant target Legendary creatures (so sadly no duplication of Ao, the Dawn Sky triggers) but its still oodles of value with the right build and the right Commander
Clearly, bragging rights and shiny trophies on your profile are the real prize for achievements in Pokemon TCG Pocket
The Pokemon Company still does print some awfully powerful Supporters from time to time, with one being a card you can't play without
However, a new leak has revealed the possible name of the next international set, along with its focus
Your other option is also excellent, which is to fight with one of your opponent's creatures, which is one the 7/7 monsters will almost always win