Support Effects are how an SZ Vivosaur affects AZ Vivosaurs. They can be positive or negative, and can affect the ally AZ or the enemy AZ, but never both AZ's. While support effects are an important part of the game, not all Vivosaurs have them. More heavily offensive Vivosaurs generally have support effects that weaken it's allies, whereas support oriented Vivosaurs tend to have positive effects.
Zongazonga gives the largest negative drop, lowering each of the stats of AZ allies by 77%.
Tro, Compso, Dilopho, Bulgon, Guan, Hibigon, Momo, and Marple have some of the most beneficial support effects, either lowering an enemy's stat(s) or raising that of an ally's by a significant amount.
Nigo and Zino are the only Vivosaurs to have support effects that only benefit the enemy. (some Vivosaurs raise some enemy stats while lowering others, like Zanth, which increases enemy Defense and Evasion by 20%, but at the same time decreases their Attack and Accuracy by 60%.)
Some Vivosaurs lack Support Effects. These Vivosaurs include: