In combination with taunt, 44/48 Speed EVS might be desirable, in order to outspeed Vaporeon. 84 Speed EVs (or more, for certainity) allow Burungeru to completely shut down Skarmory and defensive Politoed, who might switch in in hopes of Poisoning Burungeru.
I personally prefer Will-O-Wisp over Toxic as it helps against Steel types, namely Skarmory, Forretress and Nattorei, who are completely shut down by combination of Burn and Taunt, however Boiling Water might be used instead. I like WoW more for the bigger chance of Burn and its' effectiveness against Water immune Pokemons, however Boiling Water is useful namely against defensive DD Gyarados.
I personally prefer Will-O-Wisp over Toxic as it helps against Steel types, namely Skarmory, Forretress and Nattorei, who are completely shut down by combination of Burn and Taunt, however Boiling Water might be used instead. I like WoW more for the bigger chance of Burn and its' effectiveness against Water immune Pokemons, however Boiling Water is useful namely against defensive DD Gyarados.