Just saying this right now, the team itself is not TERRIBLE, but the moves they have are. For example, Jolteon's offensive stats are around 60/110. (60 being the Phy. and 110 is the Spec.) Unless for some ungodly reason you want a physical movepool, remove everything BUT Volt switch, as momentum is important. While Mixed Meta is good, why Confusion? The added bonus is only luck based, he has more options in Special moves, which almost all are better. He has no need for Aerial Ace, and should be replaced with another STAB, or Ice Punch for REAL coverage. Bulldoze is gimmicky, and should be replaced with EQ. Aura Sphere is...alright for mixed sets, but since your Lucario is a setup sweeper, it should be replaced for the higher damaged Close Combat. Also, since Shade is going to be buffed with Aegis, Crunch is an option to take care of him, rather than Poison jab. Tyranitar in general makes me cringe. ect ect. What I means is, some moves don't work well with their style of fighting and/or stats. Some are just god awful (CONFUSION? REALLY?)
As for synergy....your team really has bad type matchups. I mean, Fire and Ground types do exist, right? I think you put too much time into individual coverage in moves (which doesn't play well in Reborn League with this team) and not enough in a team strategy/synergy. None of these guys really support one or another (Except Forrtress, HE is alright), and you can't rely on Lucario setup sweeps against threats like Aegislash and Quagsire, who'll laugh at the mimimal damage you'll do as they setup/stall respectively. What i'm trying to say is, you team isn't awful, but the lack of any strategy IS. Try to find different pokemon that support some of the originals, find a form of link between all 6, and choose the right moves.