Stats
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STR or Strength affects the damage that physical attacks deal.
DEF or Defense affects the damage you take from enemy attacks.
SPR or Spirit affects the effectiveness of your Yo-kai's Technique move.
SPD or Speed affects the turn order and the number of turns the Yo-kai get each battle.
Base Stats for All Yo-kai in Yo-kai Watch 2
Other Stats
HP reaches 0 and the Yo-kai is KO'd.
Soul Meter is full then players can activate the Yo-kai's Soultimate.
Rank ranges from E, D, C, B, A, S. Higher the rank equals more powerful Yo-kai.
EXP or experience points filled up when your defeat Yo-kai and complete quests. When a full bar is filled up, the Yo-kai gains a level.
Hidden Stat Ranks
At the moment they are befriended, evolved, or fused, each Yo-kai has hidden "stat ranks" assigned to it that can never be changed unless you recruit/evolve/fuse a new one. Each stat has its own rank that influences how it will develop while leveling up. For example, a Frostail with a low SPR rank might have ~145 SPR at Lvl 50, while one with a high SPR rank might have ~155 (Attitudes not taken into account). The exact highs and lows are very specific for each Yo-kai. Here are some facts related to hidden stat ranks:
- There is a separate one for each stat.
- The ranks are generally rigid. Unlike Pokemon where the stat increase could be anywhere from 0 to 31 at Lvl 99, there is generally a set group of numbers the stat could end up at, e.g. 175, 188, 200, 212, or 225 (not accounting for Attitude).
- The higher the Yo-kai's natural stat, the more influential the ranks are. If your Yo-kai has very poor STR, low or high ranks won't be very influential, but if it has a very high STR, the ranks will make a big difference. Therefore, the goal of "soft-resetting" a Yo-kai's stats is to have high ranks in the high stats for overall superior stats.
- There appears to be some natural balancing - if a Yo-kai has a very highly-ranked stat, there will be less ranks to go around overall. Unlike Pokemon, there is no "31 in all IVs" equivalent, it's all a give and take.
- The balancing may not be 100% perfect - it is possible to occasionally find a Yo-kai with an overall exceptional allocation, although my tests only took them to Lvl 50, so it's possible it'll balance out by Lvl99.
- Very high or very low ranks are very rare. The game prioritizes more average allocations.
TL;DR If you're a min-maxing soft-resetter, aim for highs of the high stats and lows of the low stats.
Evolution and Fusion
Just like befriending a brand-new Yo-kai, evolving or fusing Yo-kai creates a completely brand-new creature. The stats/Attitude of the pre-evolved or pre-fusion monsters DO NOT MATTER. Once the evolution/fusion happens, the stat ranks are re-rolled for the new Yo-kai, and they are given their "default Attitude".
In many cases, it is wise to fuse at as low a level as possible, so that you have the most influence over the resulting monster's Attitude level-ups. A lot of Yo-Kai have HP-increasing Attitudes at default.
Formula
Stats Formula
parameters:
x, y, z: three IVs (I call them IV_A, IV_B_1 and IV_B_2 respectively.)
e: EV (attribute bonus)
l: level
B: base stats
(assuming Yo-kai grows at medium speed)
HP:
HP = floor(e * (1.0 + l * 0.0050505) + (B + x + y) + (B + x + y + z) * 0.1 * l)
Other stats:
stat = floor(e * (1.0 + l * 0.0050505) + (B * 0.1) + (B + x + y + z) * 0.05 * l)
- Note all calculations must be done using 32 bit single precision floats.
