Is this team good enogh to beat the Elite four?

I think so. The Elite Four are tough, and they will put you in a position of constant critical if you are not prepared. I believe you should learn about them before facing them and pick specific Pokemon for each member of the elite. Find out their weaknesses and stock up on a lot of potions and other things that fix different things, because they will use a special attack on you that can make you unable to fight back. Save in between battles and revive your Pokemon. So the best thing you can do is research your opponents and Level up, because the stronger the better.