PvZ 3 idea

Since in the pvz 3 ad plants are getting Fusions which I think is a good idea and an idea I had to make some zombies better would be something called evolutions and how that would work is in the later levels when certain zombies are not as scary anymore to go against they would have an evolution form(s).   
But they can only spawn after the first flag and before the level starts It would have an evolution warning saying which zombie would be evolved. And some zombies depending on their strength would have more evolutions than others

1st flag 1st evolution

2nd flag second type of evolution 

etc

For example pole vaulter evolution

normal vaults over a column

1st evolution can jump over 2 columns + slightly increased health

2nd evolution can vault a second time (but doesn’t run after first jump) + slightly increased health but can be nerfed if needed