While some Yo-kai evolve by simply levelling up, some Yo-kai can only evolve through fusion with an item or another Yo-kai. This is a list of all Yo-kai fusions in Yo-kai Watch 2.
| Yo-kai 1 | Yo-kai 2 | Evolution |
| Touphant | Fidgephant | Enduriphant |
| Herbiboy | Blazion | Carniboy |
| Pallysol | Mad Mountain | Scarasol |
| Tongus | Shmoopie | Nurse Tongus |
| No-go Kart | Ledballoon | Mistank |
| Wotchagot | Papa Windbag | Pride Shrimp |
| Mirapo | Espy | Miradox |
| Hidabat | Wydeawake | Allnyta |
| Helmsman | Armsman | Reuknight |
| Dulluma | Mochismo | Darumacho |
| Castelius III | Castelius III | Castelius II |
| Castelius II | Castelius II | Castelius I |
| Dazzabel | Cupistol | Rattelle |
| Jibanyan | Roughraff | Baddinyan |
| Jibanyan | Coughkoff | Thornyan |
| Enerfly | Enefly | Betterfly |
| Happierre | Dismarelda | Reversa |
| Hidabat | Tengloom | Abodabat |
| Yo-Kai | Item | Evolution |
| Mermaidyn | Mermaid Pearl | Mermadonna |
| Squeeky | Horn | Rawry |
| Flushback | Mem-o-Vac | Vacuumory |
| Hissfit | Tyrant's Sword | Zerberker |
| Predictabull | Ethereal Water | Smashibull |
| Toiletta | Cursed Diary | Foiletta |
| Sandmeh | Sand Suit | Mr. Sandmeh |
| Hungramps | Love-packed Rice Ball | Hungorge |
| Grumpus Khan | Carved Bear | Groupus Khan |
| Slumberhog | Goldfish Lantern | Snortlehog |
| Panja Pupil | Master's Lantern | Panja Pro |
| Samureel | Gold Emblem | Time Keeler |
| Takoyakid | Takoyaki Tray | Takoyaking |
| Danke Sand | Dune Sand | No Sandkyu |
| Sumodon | Vintage Parasol | Yokuzudon |
| Happycane | Red Hibiscus | Starrycane |
| Chansin | Legendary Blade | Sheen |
| Chansin | Cursed Blade | Snee |
| Chansin | Holy Blade | Gleam |
| Beetler | General's Soul | Beetall |
| Castelius I | Platinum Bar | Castelius Max |
| Rhinoggin | Unbeatable Soul | Rhinormous |
| Cupistol | Love Buster | Casanuva |
| Signibble | GHz Orb | Signiton |
| Frostina | Glacial Clip | Blizzaria |
| Pupsicle | Snowstorm Cloak | Chilhuahua |
| Shmoopie | Love Scepter | Pinkipoo |
| Ake | Buff Weight | Payn |
| Grumples | Ageless Poweder | Everfore |
| Timidevil | Shard of Evil | Beelzebold |
| Draggie | Dragon Orb | Dragon Lord |
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