In the rules on the main site ( http://paxpokemonleague.net/rules/ ) it says on in-depth Rule 4: Species Clause: A player’s team may not contain two Pokémon with the same National Pokédex number, and on Rule 13 it says: Limited Pokemon:There may be only 1 of any of the following Pokémon on any team: [insert list of half-legendaries here],
so according to Rule 4, you can't have 2 of the same Pokemon, and on Rule 13, it says you can't have more than 2 of only these Pokemon. If I am interpreting this right, Rule 13 should be irrelevant and doesn't need to be included, because all of those Pokemon were already included in the only 1 Pokemon in Rule 4.