Klee
Klee is a common bug.
An attached note reads, “These tiny friends like to enjoy a sunny day on an alterash field.”
Ingame
Species descriptions:
- Alta: A regular klee, caught in a bottle. I hope it feels safe and comfortable in there.
Sources
Can be bought from merchants:
Obtained by capturing creatures with any bugnet:
ct_klee
Can be obtained via 
Spawnable Item Pack or 