Rillaboom.
Champions OU usage profile · rank #12
september 2026 · 145.6K battles
september 2026 · 145.6K battles
grassPokédex entry ↗
Usage · September 2026
16.2%
Rillaboom is ranked #12 in Champions OU, carried by 43,574 teams
TierA · top 15 of the format
Ladder rank#12 of 237
Raw count43,574
Viability ceiling88
Month on month+16.18pp
13 month peak16.2%
FormatChampions OU
Base statsspecies values, before EVs and natureBST 530
HP
100
Atk
125
Def
90
SpA
60
SpD
70
Spe
85
Usage over time16.2%▲ 16.18pppeak 16.2% · Sep '26
hover a month for the exact figure · 13 months of ladder history
Most used set
24.6% of Rillaboom teamsHP
2
Atk
32
Def
0
SpA
0
SpD
0
Spe
32
NatureAdamant
AbilityGrassy Surge · 99.9%
ItemTerrain Extender · 26.0%
EV spread2 HP / 32 Atk / 32 Spe
Moves
96.5%
77.7%
77.6%
68.0%
Alternative spreads
over 5% usageJolly2 HP / 32 Atk / 32 Spe20.8%
Adamant26 HP / 32 Atk / 8 Spe5.7%
Moves
7 tracked96.5%
77.7%
77.6%
68.0%
25.7%
22.0%
15.5%
Items
26.0%
24.8%
24.4%
12.1%
7.8%
Abilities
99.9%
0.1%
EV spreads
top 6Adamant2 HP / 32 Atk / 32 Spe24.6%
Jolly2 HP / 32 Atk / 32 Spe20.8%
Adamant26 HP / 32 Atk / 8 Spe5.7%
Adamant24 HP / 32 Atk / 10 Spe5.3%
Adamant25 HP / 32 Atk / 9 Spe4.5%
Adamant30 HP / 32 Atk / 4 Spe3.3%
Top teammates
share of teams
Best Rillaboom build for Champions OU
The set above is the one Champions OU players run most often, taken from 145,642 battles in September 2026. Rillaboom sits at rank #12 with 16.2% usage, which puts it in A tier, up 16.18 points on the month before.
These are usage numbers, not a recommendation from a council. A move at 90% is close to mandatory; anything under 30% is a tech pick that answers a specific matchup. Read the spreads the same way: the top spread is the safe default, and the alternatives usually trade bulk for speed or the other way round.
The checks and counters table is generated from real games rather than a type chart, so it accounts for items, Tera choices, and how often the matchup ends in a switch instead of a knockout.