Tetrathlon Nationals Qualifier This Tetrathlon selection event will be hosted by Leven Pony Club. This Nationals qualifier will be a full Tetrathlon competition and the phases will be held at the North Motton Equestrian Centre, North Motton Hall and Devonport Aquatic Centre. Riders must attend the full weekend competition and complete all phases at the level required for their Nationals age group to be eligible for selection.