yes they arent rare you just have to be sergeant to be able to do them.. if you wanna get seals fast and have leve allowance to blow just keep spamming the NPC and if u get a leve that isnt one of the 2 /poke ones just take it and abandon it immediately and repeat until you get one of those. i usually do them on 3 stars and can finish in 2-4 minutes.

One wierd thing is tho at 3 stars u get 90+10 for difficulty but sometimes i get an extra 10 for a total of 110. they leve results window doesnt describe what the extra 10 is for, and ive gotten it with both speed and without speed bonuses