Types of Gatcha
There are currently only two types of gatcha events:
- Spotlight Gatcha (スポットライトガチャ) is a trap gatcha featuring an existing 3★ from the pool. The chances are the same, except should you roll the 3★ bot/part type, you're likely to get the featured Medabot instead of a random something.
- Pickup Gatcha (ビックアップガチャ) is a standard gatcha with unique off-pool bots added. The chances are the same for the item types, but you'll now have more things to possibly get from each pool. Typically the uniques are rate up too.
(The perpetual gatchas don't count)
Furthermore, a 10-pull is guaranteed a set from either rarity (20% to be from the featured pool).
When you pull the Gatcha, the server first selects a rarity based on the probabilities above. Then, it picks an item from the category pool to then give to you. Each possible drop can have different weightings.
Non-Paid (ie. Friend Point and MedaLeague Gatchas) and Fierce Battles still grant Research Levels for the particular part you get a duplicate of.
Gatcha prices are three (3) rubies per pull or thirty (30) rubies per ten-pull.
You can find a list of Gatchas here.