Flat stats across the board. Bashful sounds balanced, but in practice every Pokemon benefits from boosting at least one stat. Use a Mint to change to Adamant, Jolly, Modest, or Timid.

Bashful is a neutral nature with no stat change. For special attackers, use Modest or Timid instead.
#PokemonNatureTierRoleAbilitySpe
1
Flutter Mane
Flutter Mane
GHOSTFAIRY
TimidSSpecial AttackerProtosynthesis135
2
Greninja
Greninja
WATERDARK
TimidSSpecial AttackerBattlebond122
3
Gholdengo
Gholdengo
STEELGHOST
TimidSUtilityGoodasgold84
4
Raging Bolt
Raging Bolt
ELECTRICDRAGON
ModestSBulky SupportProtosynthesis75
5
Landorus
Landorus
GROUNDFLYING
TimidSUtilitySheerforce101
6
Latios
Latios
DRAGONPSYCHIC
TimidSSpecial AttackerLevitate110
7
Tornadus
Tornadus
FLYING
TimidSSpecial AttackerPrankster111
8
Miraidon
Miraidon
ELECTRICDRAGON
TimidSSpecial AttackerHadronengine135
9
Kyogre
Kyogre
WATER
TimidSSpecial Revenge KillerDrizzle90
10
Gengar
Gengar
GHOSTPOISON
TimidASpecial AttackerLevitate110
11
Starmie
Starmie
WATERPSYCHIC
TimidASpecial AttackerNatural Cure115
12
Dragapult
Dragapult
DRAGONGHOST
TimidASpecial AttackerInfiltrator142
13
Heatran
Heatran
FIRESTEEL
TimidASpecial AttackerFlashfire77
14
Glimmet
Glimmet
ROCKPOISON
TimidAUtilityToxicdebris60
15
Elekid
Elekid
ELECTRIC
TimidASpecial AttackerVitalspirit95
Flutter Mane
Flutter Mane
GHOST FAIRY
S
Nature
Timid
Role
Special Attacker
Ability
Protosynthesis
Spe
135
Greninja
Greninja
WATER DARK
S
Nature
Timid
Role
Special Attacker
Ability
Battlebond
Spe
122
Gholdengo
Gholdengo
STEEL GHOST
S
Nature
Timid
Role
Utility
Ability
Goodasgold
Spe
84
Raging Bolt
Raging Bolt
ELECTRIC DRAGON
S
Nature
Modest
Role
Bulky Support
Ability
Protosynthesis
Spe
75
Landorus
Landorus
GROUND FLYING
S
Nature
Timid
Role
Utility
Ability
Sheerforce
Spe
101
Latios
Latios
DRAGON PSYCHIC
S
Nature
Timid
Role
Special Attacker
Ability
Levitate
Spe
110
Tornadus
Tornadus
FLYING
S
Nature
Timid
Role
Special Attacker
Ability
Prankster
Spe
111
Miraidon
Miraidon
ELECTRIC DRAGON
S
Nature
Timid
Role
Special Attacker
Ability
Hadronengine
Spe
135
Kyogre
Kyogre
WATER
S
Nature
Timid
Role
Special Revenge Killer
Ability
Drizzle
Spe
90
Gengar
Gengar
GHOST POISON
A
Nature
Timid
Role
Special Attacker
Ability
Levitate
Spe
110
Starmie
Starmie
WATER PSYCHIC
A
Nature
Timid
Role
Special Attacker
Ability
Natural Cure
Spe
115
Dragapult
Dragapult
DRAGON GHOST
A
Nature
Timid
Role
Special Attacker
Ability
Infiltrator
Spe
142
Heatran
Heatran
FIRE STEEL
A
Nature
Timid
Role
Special Attacker
Ability
Flashfire
Spe
77
Glimmet
Glimmet
ROCK POISON
A
Nature
Timid
Role
Utility
Ability
Toxicdebris
Spe
60
Elekid
Elekid
ELECTRIC
A
Nature
Timid
Role
Special Attacker
Ability
Vitalspirit
Spe
95
Bashful is a neutral nature — no stat is increased or decreased.
Competitive Role
No competitive advantage. A stat-boosting nature is almost always preferred.
How to Get
SynchronizeLead with a Bashful Pokemon that has the Synchronize ability. Wild Pokemon will match its nature. (Gen 3+)
BreedingGive the parent with Bashful nature an Everstone. The offspring will inherit it. (100% since Gen 5)
Nature MintUse a Bashful Mint to change stat effects to Bashful. The original nature name stays but stats change. (Gen 8+)
What does the Bashful nature do in Pokemon?
Bashful leaves all stats untouched. No 10% boost, no 10% cut. It's one of five natures that have zero competitive impact.
Is Bashful nature good?
Honestly? Never, for competitive play. Some people argue a neutral nature works when a Pokemon uses all stats equally, but that scenario basically doesn't exist. Pick a stat to boost.
How do I get a Bashful nature Pokemon?
Wild Pokemon have a random nature, so you might get Bashful naturally. Synchronize and Everstone breeding also work. But the real question is why you'd want to keep it.
When should you use a neutral nature?
Almost never. The only edge case is a Pokemon that uses physical moves, special moves, and needs every defensive stat and Speed. That Pokemon doesn't really exist in competitive. Even mixed attackers prefer Naive, Hasty, or another nature that at least boosts Speed.