Little mini bio I made when I was bored. Did this for all the members of Team Justice.

Gridiron is the eldest member of Team Justice. He's hardy, gentle, and protective to many. He embodies the saying "with age comes experience", as he's able to fight many tough battles without slowing down, proving himself as a powerful juggernaut. While this gentle giant is always ready for a battle, he does not like resorting to pure violence and is hard to aggravate. In a way, Gridiron acts like Team Justice's very own grandfather.

Origins:
Paying a visit to Marowak's Dojo, the two are met by a large Aggron already testing his might in the dojo. Shortly after they had arrived, the Aggron recognized Phoenix and Forest as the heroes who saved the world, being impressed that two young Pokémon were able to save so many lives. Soon enough, the Aggron had revealed himself to be elderly, and introduced himself as Gridiron.

Asking what the Aggron was doing in the dojo, Marowak had answered, saying that Gridiron wanted to get some exercise and even offered to help some rookie Pokémon with their battling skills. Offering to test Phoenix and Forest's strength, the two agreed to it.

Gridiron's defense and endurance was enough to withstand the hits of multiple Pokémon at once, and after their sparring was finished, Forest suggested to Gridiron to join Team Justice, as someone with his sheer durability would prove handy to their rescue work. Despite initial modesty and reluctance, Gridiron agreed to help Team Justice.