Zoid can evolve (if possible) when they are level 35, and if they have a 3rd Form level 75
Sheild Liger->Blade Liger->Crimet Blade Liger
Gordon-> Gojulas-> Giga Gojulas
Geno Saurur->Geno Breaker
Guysack-> Death Stinger(level 75 for this one)
Command Wolf-> Koing Wolf
Pteras->Salamandra