Pokemon Arena 2D Type Wheel Draft Guide: 12-Pick-6 Synergies & Odds

How Does the 12-Pick-6 Draft Algorithm Work in Pokemon Arena 2D?

Every match on Pokemon Arena 2D Online begins by shuffling the 18 elemental types and dealing 12 types (DRAFT_POOL_SIZE = 12) into the center Available grid. Six types are excluded completely from that match—and spotting which 6 types are missing is the #1 secret to drafting an unkillable team!

Step-by-Step Draft Sequence

1. The Silhouette Tiebreaker (guessChoices): Before the draft board opens, four Pokémon names sharing the exact same primary type appear below a black silhouette. Because all three decoys share the answer’s type, you must read the silhouette’s outline (horns, tail, wings) rather than guessing by color.
2. Alternating 6-Pick Draft: You and your opponent take turns picking 1 type at a time until both rosters reach 6 types (POOL_SIZE = 6).
3. CPU Counter-Pick Logic (cpu.js): Unlike a random bot, the CPU scores every remaining type in the 12-type pool against your visible picks. If you open with Fire, the CPU strongly prioritizes Water, Ground, or Rock on its very next turn.

The 3 Best 3-Type Draft Cores in Pokemon Arena 2D

Instead of picking six isolated types, build your draft around one of these three proven 3-Type Tri-Cores (check individual rankings in our 18-Type Fighter Tier List):

How the Wager Odds Engine (wallet.js) Calculates Payouts

Once all 12 picks (6 vs 6) are locked in, WALLET.odds(myTypes, cpuTypes) runs a 36-pairing matrix scan (6 × 6) to determine whether you are the FAVORITE, EVEN, or the UNDERDOG:

Exact Matchup Differential (diff) Formula

For every pairing between one of your 6 types (mi) and one of the CPU’s 6 types (ti), the game adds to diff:

• Your Attack on CPU (EFF[mi][ti]): 2× adds +1.0, 0.5× subtracts -0.5, 0× subtracts -1.0.
• CPU’s Attack on You (EFF[ti][mi]): 2× subtracts -1.0, 0.5× adds +0.5, 0× adds +1.0.
• Implied Win Chance (p): Passed through a logistic curve p = 1 / (1 + exp(-0.12 × diff)) and clamped between 15% and 85%.
• Payout Multiplier (mult): Calculated as mult = (1 + 0.05) / p (+5% Player Edge) and clamped between 1.2× and 4.5×.

Why Underdog + Scouting Visor Is the Fastest ₽ Farm in the Game

Notice what WALLET.odds() does NOT include in its math:

1. It does not count your PC BST HP Bonus (+1 to +8 HP per blade, up to +42 HP across your 6 blades!).
2. It does not count your Scouting Visor revealing the CPU’s Special.
3. It does not count your +35 HP mid-match Potion or human Special launch timing!

That means a human player with evolved +5 HP blades, a ₽100 Potion, and smart Special Launch Timing actually has a 65%+ real win rate in drafts that the odds engine labels as a 40% Underdog (2.6× payout)! That is the secret to farming ₽15,000 for Box Legendaries in The Lab in a single afternoon.