Pet Simulator 99 Ultimate Fusion Guide 2026 – How to Fuse for Rare Pets

Fusion is one of the best ways to get rare and exclusive pets in PS99 without spending diamonds. This guide covers everything you need to know about the fusion system, including the best combinations and tips to save resources.

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How Fusion Works

Fusion allows you to combine multiple pets of the same rarity into a single pet of a higher rarity. The process costs gold and time. Higher rarity fusions take longer but yield better results.

Fusion Requirements

Same Rarity: You need 3-5 pets of the same rarity to fuse.
Gold Cost: Fusion costs gold – the higher the rarity, the more it costs.
Time: Fusion takes time (from 1 minute for common to 24 hours for mythical).
Luck: Some fusions have a chance to produce a "shiny" or "rainbow" variant.

Best Fusions to Prioritize

Fusion	Input Pets	Output Pet	Time	Value
Common → Uncommon	3 Common	Random Uncommon	1 min	Low
Uncommon → Rare	3 Uncommon	Random Rare	5 min	Low
Rare → Ultra-Rare	3 Rare	Random Ultra-Rare	15 min	Medium
Ultra-Rare → Legendary	3 Ultra-Rare	Random Legendary	1 hour	High
Legendary → Mythical	3 Legendary	Random Mythical	4 hours	Very High
Exclusive → Huge	5 Exclusives	Huge Pet (low chance)	12 hours	Extreme

Fusion Tier List (Best Outputs)

S-Tier: Huge Fusion (5 exclusives) – rare but game-changing.
A-Tier: Legendary → Mythical fusion – gives access to top-tier pets.
B-Tier: Ultra-Rare → Legendary – good for farming legendaries.
C-Tier: Rare → Ultra-Rare – not worth the gold unless you have excess.

Tips to Maximize Fusion

Save your exclusives – don't fuse them unless you have 5 of the same type.
Use Luck Potions before starting a high-level fusion to increase the chance of a shiny or rainbow outcome.
Fuse during events – some events offer bonus fusion speed or reduced costs.
Check the value – before fusing, check if the output pet is worth more than the input pets combined.
Don't fuse commons – it's not worth the gold. Save them for trading or selling.

Common Fusion Mistakes

Fusing too early – wait until you have a good collection of pets before starting high-level fusions.
Ignoring gold costs – high-level fusions can cost millions of gold. Plan accordingly.
Fusing exclusives – only do this if you have duplicates. Exclusives are valuable for trading.

Fusion Calendar (Best Times to Fuse)

Weekends: 2x fusion speed events often occur on weekends.
Holidays: Special fusion events with reduced costs.
Server Events: Sometimes fusion costs are halved during server-wide events.

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