Teaming with cheaters is prohibited on any game and it may also result in a ban if caught teaming with them or even using them to gain free wins/kills in eggwars, Assassinations etc. (Even if you don't want them to kill you)Can you team with hackers in FFA so they wont kill you?
You can read more about the rule here: https://www.cubecraft.net/threads/official-rules.134453/Knowingly teaming with/having someone use illegal mods for you may result in a ban as well.