Why can't I catch Grimer and is it worth it to catch?

Question

I was looking for a Grimer in the trainer school. They have high catch rare, more than 20% when full HP, but I couldn't catch one. I have lowered the HP to red and kept throwing Pokeballs until it KOed all of my Pokemon. Did I miss something? It's not legendary or anything. Why so hard? (this is in Ultra Moon)

Comments

Which pokeball did you use?

Answer 1

Well, @ 20% Hp
> You have a 72.061% chance of capturing it per ball. Thus, you have at least a 50% chance of catching it within 1 ball and at least a 95% chance of catching it within 3 balls.

So, you probably had bad luck :(
Grimer is easy to catch in every pokeball but a beast ball, so use a great ball (97%) or Ultra ball (100%) if you realy still find this hard to catch.
Source

Comments

as for being worth to catch, i'd say so: it's only weakness is ground, it gets 2 decent abilities (poison touch/gluttony) it levels up and evolves pretty quickly, and gets a good movepool.

---

Grimer also has pretty good stats. It can take a hit and hit back pretty hard.