+1. As he said. Is ok that the player have to make an effort to get a reward. But ill show My case as an example. I'm in the 7th day and the reporter asked me for "skorupi". Looking for spanws it just appear or in cerulean cave (tier 9 without ms) OR with ms In sinnoh safari or route 114. I don't have ms and it should cost me around 200k, add safari pass 24hrs (Since tier 8 won't be easy to get in 20 mins safari pass unless You are really lucky). Here obviously i'll go to cerulean cave (i won't spend 200k in ms if i have the chance to get "silver disc" as part of a reward). Also think about those players that doesnt have ms or Even cerulean cave unlocked, 7 days wasted.
The point here is. Ok fresh caught (Even if it hurts) but pokemons from sinnoh and without ms. This is a good quest, don't kill it.
According to rewards.
Day 4: x3 rare candies or random fossil.
Day 7: x1 masterball.
The other days are ok ig.
Pokémon tiers from 1-7 imo (8-9 are insane)