Where can I see every Irisalis petal source?

The list has a Permanent category, so you can tell petals that stay available from limited ones before you plan your week. It shows every route in one place, which makes it the first thing to check when you come up short.

The Legendary Journey tab sits in the same event menu and tracks how many Iris Petals you have and what is still required. You spend petals in the event menu. They make the Irisalis Aniipod first, and with more petals, Wind Chaser's Departure. The event runs until December.

What the How to obtain list covers

Some entries are one-off rewards you pick up just by playing. Earning a silver badge in a region awards Iris Petals. Your first win against each Alpha Aniimo, Alpha Minespine included, gives a petal and uses no energy. Branch Nurturing awards three petals for each level of the main branch, and you level it by infusing Lumin Amber.

Other entries come from main story and journey quests, side stories, exploration including Breezy Plains, a gather task for collecting items around the world, and fighting Irisalis at the Faded Rainbow, which needs player level 20.

The weekly Irisalis investigation is the capped one. You can clear it twice per week, so if you skip a week, those petals are gone.

Not settled: It is not settled where most petals come from. They may come mainly from permanent progression, or mainly from the stamp shop and event shop. Check the How to obtain list in your own event menu for the current mix.