a.rb

class ShowdownBot
  attr_accessor :team, :tier, :ladder, :p1_pkmn, :p2_pkmn, :p1_name, :p2_name

  @ws = nil
  @moves = Hash.new { |h,k| h[k] = Array.new }

....

when 'request'
  team = JSON.parse(m[2])
  moves = ['keldeo', 'gengar']
 
  moves.each do |move|
      @moves[:moves] << {:name => move}
  end