I don't know of it possible, but I should like it if we got a few
new quest, so you can get some legendary / event pokemon, or even
shiny pokemon a little bit easier. I know it cost a lot time and
work to make a new quest, but I do have enough ideas for new
quests. Please support this idea, but anyway, if it's not possible
I'll also understand it.
Another suggestion is to add daily quests, like in the dream shop.
You have to do a few things and every day you can get a few items /
a rare item / pd / maybe nuggets / low rarity level pokemon. So you
can get rare items and nuggets easier, but the reward is every day
different.