I can see the beginnings of a Voltturn set on this team with the Mienshao, Gligar, and Jolteon core, but I'd say that Jolteon has the least functionality on your team. Its shallow movepool and okay sp.atk really hinder its potential as a special attacker.
As for glaring weaknesses, I'd say that a well-played Mega Aerodactyl, DD Salamence with Iron Tail, or Snorlax (once mienshao faints) can completely obliterate you team. Salamence is a very serious issue with your team since at +1, Salamence outspeeds everything on your team (including mienshao because it's adamant) and is only stopped by gligar, which can be taken care of with ice or special attacks.
EDIT: Jolly Entei is illegal since event Entei can only have adamant.