Below is a list of all Gym Leaders, Elite Four Members, and the Champion. Note that there can be up to 12 gym leaders and 5 elite four members so that these players are able to challenge the league themselves. The following table records each challenger's wins against each Gym or Elite Four Member.
Psychic - Mystraker
Water - SonFlygon
Record of challengers who have successfully cleared the Elite Four:
Battlestorm
Clear Date: November 14, 2014
Tenure as Champion: November 14, 2014 - June 10, 2015 (208 days)
Team: Not Revealed
VG
Clear Date: June 6, 2015
Tenure as Champion: June 10, 2015 - Present
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Listed here is the number of times Gym Leaders successfully defended their Gym Badge by winning a battle against a challenger
Mystraker - 24
tjiszero - 23
SonFlygon - 16
Pixellanious - 11
Yagami - 8
Prominence - 7
Marethyu - 7
Pikami - 7
TheRagingExploud - 2
xPhantomhive - 1