i know this is really off topic but me and my mates are really stuck on a pokemon to finish my team off with

my team so far is
-togekiss
-blazikan
-feraligatr
-tyranitar

thanks if you can help me out

Put in Salamence or Flygon, or Lucario with Aura Sphere, Dragon Pulse and Dark Pulse

For the other slot, An electrivire would work, or put in a Aerodactly with thunder, fire and ice fang for revenge killing and fragile pokemon

id go for a physical wall, skamory with spikes would work and a staller, Spritombholding brightpowder with suckerpunch, smokescreen, nastyplot and an fairly stong special move would work, also id consider changing feraligator to a bulkier water type like Swampert or Milotic

I agree with Jester, a Tank/Wall/Sponge whatever you wanna call it could help a lot.

my personal favorite Wall (specially cause its so annoying to the opposing team haha) is a blissey. Immense HP, max sp defense, and if you EV train the reg defense up...well..you just cast toxic on the pokemon and sit there healing yourself while they slowly die XD Blissey also can learn two moves that heal the status impailments of everyone on your team. so..sit there slowly killing someone WHILE healing your team.

snorlax is always a great tank because he can dish out huge damage although his survivability is nowhere near blissey's.

I'd poke around the internet and see what tank-type poke you like best and try that out.