ok yeah, sorry i should have done this sooner but stuff has been extremely hectic as of late. i read over your guys' posts & i do agree with what was mentioned, so i will make this final decision:
we will be building around choice band terrakion (can be changed to sd lo down the road if it fits better) as the team will show more variation than if it was alongside mega latias which really forces a type of team that has already been established.
as this has changed last minute, i will be giving you guys a few extra days to submit suggestions of pkmn to be used alongside terrakion only! just to give some information before we hope right into this build, band terrakion is a strong wallbreaker, meaning we build around its strengths in pressuring the opponent's team constantly.
i believe this was a good decision & i thank those who posted above to put this round in the correct direction. remember we are building around band terrakion only & lets have fun!
edit: when posting your recommendation, make sure to include a brief description of why that specific pkmn fits optimally alongside band terrakion!