hmm this is the first time I heard of "alternate evolutions"
I always thought there's Evolutions + Ascensions and both of them aren't mutually exclusive
how do we activate these alternate ones?
For 4* or 5*?
I'm unsure of 4*, since I only now learned that there was more than one way to evolve them. If you're talking about 5*, from what I see they each only have one "evolution" but different ascensions they can do afterwards, depending on what materials you feed them. You can also go straight from 5* right to an ascension, but it requires more materials than if you evolve them to their 6* form first.
I have a Harley X backed up on my google plus account and I've rolled a ton on there so I only get one stone per friend now. I am rerolling in hopes of a Zeus. is he really worth it?
Zeus is supposedly really great, but you need to have him in his Ascended/Dark Zeus state. He's not a horrible unit earlier by any means, but some [such as Arthur] give you that "Godly Unit" feeling right from the start. I'm content with him, and don't regret having it as my primary role, but I'd still like to obtain Arthur for my team.
I'd try again at the Gatcha, but considering in total I've rolled probably 200+ times [this is taking into account my re-rolls] and not seeing Arthur once, I'm hesitant. I also only saw Zeus once [which I kept] and Striker once [which was on my Zeus file]. For having an "increased odds of being pulled" they certainly seem rare when compared to other 5*. :/