What is a good nature for Rotom??

Question

What is a good nature?? Im getting confused.

Comments

What form? TBH probably Bold :P

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What are its moves? Do you want to use this Rotom for battling other people?

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A Bold nature+the Assault Vest.

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Here is my Rotom to consider, it works well with all Forms:

Rotom @ Assault Vest  
Ability: Levitate  
EVs: 238 HP / 20 Def / 240 SpA / 4 SpD / 8 Spe  
Bold Nature  
IVs: 0 Atk  
- Discharge  
- Shadow Ball  
- Signal Beam  
- Swift  

Rotom-Heat @ Assault Vest  
Ability: Levitate  
EVs: 238 HP / 20 Def / 240 SpA / 4 SpD / 8 Spe  
Bold Nature  
IVs: 0 Atk  
- Discharge  
- Shadow Ball  
- Signal Beam  
- Overheat  

Rotom-Wash @ Assault Vest  
Ability: Levitate  
EVs: 238 HP / 20 Def / 240 SpA / 4 SpD / 8 Spe  
Bold Nature  
IVs: 0 Atk  
- Discharge  
- Shadow Ball  
- Signal Beam  
- Hydro Pump  

Rotom-Frost @ Assault Vest  
Ability: Levitate  
EVs: 238 HP / 20 Def / 240 SpA / 4 SpD / 8 Spe  
Bold Nature  
IVs: 0 Atk  
- Discharge  
- Shadow Ball  
- Signal Beam  
- Blizzard  

Rotom-Fan @ Assault Vest  
Ability: Levitate  
EVs: 238 HP / 20 Def / 240 SpA / 4 SpD / 8 Spe  
Bold Nature  
IVs: 0 Atk  
- Discharge  
- Shadow Ball  
- Signal Beam  
- Air Slash  

Rotom-Mow @ Assault Vest  
Ability: Levitate  
EVs: 238 HP / 20 Def / 240 SpA / 4 SpD / 8 Spe  
Bold Nature  
IVs: 0 Atk  
- Discharge  
- Shadow Ball  
- Signal Beam  
- Leaf Storm

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Try Timid.

Answer 1

It depends on the form, and also its role/moveset. Rotom-Wash, for example, is commonly used as a defensive pivot, as it has a good defensive typing, and can hit ground types with Hydro Pump. A Bold Nature would be best for this.

For more offensive forms, such as Rotom-Heat, pick a nature that best fits its moveset. For example, a special tank Rotom should have a Modest Nature, and a Choice Scarf Rotom should have Timid.

So, the natures you can give Rotom can vary, but for competitive, you should probably only be considering Modest, Timid, Bold, and Calm.

Go here for further analysis.