Trick Room walls exist, and they use Relaxed. 10% more Defense, 10% less Speed. That Speed drop actually helps under Trick Room. Mesprit is one of the most popular Relaxed users, alongside Ting-Lu and Amoonguss.

Relaxed raises Defense by 10% and lowers Speed by 10%. Slow physical walls, often used in Trick Room. 100 Pokemon competitively run this nature.
#PokemonTierRoleAbility+Def-SpeSpe
1
Mesprit
Mesprit
PSYCHIC
SBulky SupportLevitate
105+15
80-10
80
2
Ting-Lu
Ting-Lu
DARKGROUND
SBulky SupportVesselofruin
125+17
45-7
45
3
Amoonguss
Amoonguss
GRASSPOISON
ABulky SupportRegenerator
70+12
30-5
30
4
Alomomola
Alomomola
WATER
ABulky SupportRegenerator
80+13
65-9
65
5
Tyranitar
Tyranitar
ROCKDARK
ABulky SupportSand Stream
110+16
61-9
61
6
Slowbro
Slowbro
WATERPSYCHIC
ABulky SupportRegenerator
110+16
30-5
30
7
Torkoal
Torkoal
FIRE
ABulky SupportDrought
140+19
20-4
20
8
Rhyperior
Rhyperior
GROUNDROCK
ABulky SupportSolidrock
130+18
40-6
40
9
Celesteela
Celesteela
STEELFLYING
ABulky SupportBeastboost
103+15
61-9
61
10
Bronzong
Bronzong
STEELPSYCHIC
ABulky SupportLevitate
116+16
33-6
33
11
Mimikyu
Mimikyu
GHOSTFAIRY
ABulky SupportDisguise
80+13
96-12
96
12
Jirachi
Jirachi
STEELPSYCHIC
ABulky SupportSerenegrace
100+15
100-12
100
13
Uxie
Uxie
PSYCHIC
ABulky SupportLevitate
130+18
95-12
95
14
Whimsicott
Whimsicott
GRASSFAIRY
ABulky SupportPrankster
85+13
116-14
116
15
Mudsdale
Mudsdale
GROUND
ABulky SupportStamina
100+15
35-6
35
16
Diancie
Diancie
ROCKFAIRY
ABulky SupportClearbody
150+20
50-7
50
17
Regirock
Regirock
ROCK
ABulky SupportClearbody
200+25
50-7
50
Mesprit
Mesprit
PSYCHIC
S
Role
Bulky Support
Ability
Levitate
+Def
105 +15
Spe
80
Ting-Lu
Ting-Lu
DARK GROUND
S
Role
Bulky Support
Ability
Vesselofruin
+Def
125 +17
Spe
45
Amoonguss
Amoonguss
GRASS POISON
A
Role
Bulky Support
Ability
Regenerator
+Def
70 +12
Spe
30
Alomomola
Alomomola
WATER
A
Role
Bulky Support
Ability
Regenerator
+Def
80 +13
Spe
65
Tyranitar
Tyranitar
ROCK DARK
A
Role
Bulky Support
Ability
Sand Stream
+Def
110 +16
Spe
61
Slowbro
Slowbro
WATER PSYCHIC
A
Role
Bulky Support
Ability
Regenerator
+Def
110 +16
Spe
30
Torkoal
Torkoal
FIRE
A
Role
Bulky Support
Ability
Drought
+Def
140 +19
Spe
20
Rhyperior
Rhyperior
GROUND ROCK
A
Role
Bulky Support
Ability
Solidrock
+Def
130 +18
Spe
40
Celesteela
Celesteela
STEEL FLYING
A
Role
Bulky Support
Ability
Beastboost
+Def
103 +15
Spe
61
Bronzong
Bronzong
STEEL PSYCHIC
A
Role
Bulky Support
Ability
Levitate
+Def
116 +16
Spe
33
Mimikyu
Mimikyu
GHOST FAIRY
A
Role
Bulky Support
Ability
Disguise
+Def
80 +13
Spe
96
Jirachi
Jirachi
STEEL PSYCHIC
A
Role
Bulky Support
Ability
Serenegrace
+Def
100 +15
Spe
100
Uxie
Uxie
PSYCHIC
A
Role
Bulky Support
Ability
Levitate
+Def
130 +18
Spe
95
Whimsicott
Whimsicott
GRASS FAIRY
A
Role
Bulky Support
Ability
Prankster
+Def
85 +13
Spe
116
Mudsdale
Mudsdale
GROUND
A
Role
Bulky Support
Ability
Stamina
+Def
100 +15
Spe
35
Diancie
Diancie
ROCK FAIRY
A
Role
Bulky Support
Ability
Clearbody
+Def
150 +20
Spe
50
Regirock
A
Role
Bulky Support
Ability
Clearbody
+Def
200 +25
Spe
50
+10%Defense
-10%Speed
Flavor Preference
Likes Sour, dislikes Sweet
Competitive Role
Slow physical walls, often used in Trick Room.
Relaxed vs Bold
Choose Relaxed
+Defense / -Speed
  • Pokemon that need to check physical threats (use +Def)
  • Pokemon that need to check special threats (use +SpD)
  • Walls and tanks that rarely attack
Choose Bold
+Defense / -Attack
  • Defensive Pokemon that still need attacking power
  • Pokemon that run both physical and special moves
How to Get
SynchronizeLead with a Relaxed Pokemon that has the Synchronize ability. Wild Pokemon will match its nature. (Gen 3+)
BreedingGive the parent with Relaxed nature an Everstone. The offspring will inherit it. (100% since Gen 5)
Nature MintUse a Relaxed Mint to change stat effects to Relaxed. The original nature name stays but stats change. (Gen 8+)
Other +Defense Natures
Bold (-Attack)Impish (-Sp. Attack)Lax (-Sp. Defense)
What does the Relaxed nature do in Pokemon?
Relaxed gives your Pokemon 10% more Defense at the cost of Speed. That tradeoff works best when the lowered stat isn't part of your moveset. Pokemon with Relaxed nature prefer Sour flavor and dislike Sweet.
What are the best Relaxed nature Pokemon?
Competitively, Mesprit, Ting-Lu, Amoonguss, and Alomomola run Relaxed most often. The +Defense boost complements their role, and the -Speed penalty barely affects their game plan.
Is Relaxed a good nature for competitive Pokemon?
For the right Pokemon, Relaxed is one of the best natures you can pick. The -Speed drop actually helps under Trick Room, where slower Pokemon move first. Just don't slap it on something that uses Speed-based moves.
How do I get a Relaxed nature Pokemon?
Breeding with an Everstone is the most reliable approach since Gen 5. The parent holding it passes its nature to every offspring. Synchronize works for wild catches. And if you already have the Pokemon, a Relaxed Mint from the Battle Tower changes the stat effects to Relaxed.
Should I use Relaxed or Bold?
Short answer: Relaxed for Trick Room wall, Bold for standard wall. There's no universal best. Check your Pokemon's base stats and common threats in the format you're playing to decide which tradeoff is better.