Takeshi

Takeshi appeared primarily as an opponent to Satoshi in his debut episode unlike later Gym Leaders he requested to join Satoshi on his journey aiming to be the worlds greatest Pokmon Breeder. Takeshi mainly provides an advisory role to the other main characters of the anime being several years older than the rest of them. His knowledge of Pokmon battles is great causing him to often referee matches between Satoshi and others. Takeshi also fancies himself as something of a ladies man though each time he hits on someone he is either rejected outright pulled away by Kasumi or Masato or more recently Poison Jabbed by his Gureggru. Source: Bulbapedia