Pokemon Java

A program to simulate Pokemon battles¹

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Instructions

1 vs 1 Pokemon battle

javac *.java && java -ea PokemonBattle

1 vs 1 Pokemon battle with pre-selected pokemon

javac *.java && java -ea PokemonBattle charizard venusaur

1 vs 1 Pokemon battle simluated

javac *.java && java -ea PokemonBattle charizard venusaur skip

Trainer Battle

javac *.java && java -ea TrainerBattle

Elite Four Battle

javac *.java && java -ea EliteFour

Extras

• When prompted to select a Pokemon, use "custom" to be prompted to enter custom stats and attacks
• Use an underscore "_" in front of a Pokemon's name to maximize its stats.
  • IVs will all be set to 31 (highest possible)
  • EVs will be allotted depending on base stats. A Pokemon has 510 EVs to allocate between its 6 stats, but no single stat can receive more than 252.
    • If base SPEED is above a threshold, then 252 EVs will go to the higher of the two attack stats, 252 EVs will be given to SPEED, and the remaining 6 EVs will be given to HP.
    • If base SPEED is below a threshold, then 252 EVs will go to the higher of the two attack stats, and 252 are distributed to HP, DEFENCE, & SPECIAL_DEFENCE depending on the proportion that would best balance between them e.g. more EVs go to DEFENCE if it is much lower than HP and SPECIAL_DEFENCE. We technically could allocate 258 EVs between the three defensive stats, but to prevent one of the defensive stats from getting more than 252 EVs (which would happen in a severe imbalance), 6 EVs are given to SPEED.
  • Nature (which affects which stat has a 1.1 multiplier and which has a 0.9 multiplier) will be set depending on base stats. As a general rule, HP cannot be affected by nature.
    • If base SPEED is above a threshold, attenuate the lower of the two attack stats and accentuate SPEED.
    • If base SPEED is below a threshold, attenuate the lower of the two attack stats and accentuate the higher of the two attack stats.

Notes

• If a Pokemon has multiple attacks, it will automatically select the "best" attack against a given opponent.
• The difficulty for the TrainerAI is based on simulated battles that it runs between all the Pokemon. Pokemon that win more frequently appear when higher difficulty is chosen. If you select a difficulty above the maximum, The Pokemon Master will challenge you - this trainer always chooses the Pokemon that wins most frequently against your Pokemon.
• Each row in wins.csv contains the percentage of wins a Pokemon had against each opposing Pokemon (obtained from simulating 500 battles). For example, row 0 column 1 is the probability Venusaur beats Charizard. The element in index [i,j] is equal to 1 minus the element in [j,i] of the matrix because every loss for one Pokemon was a win for the other.

Reference

1) ASCII art by Maija Haavisto ↩