TRUTH - Bozo (this one is fine, just making sure you know)
Serra - Aromaflora, I don't think her Pokemon are redis unless you get them directly form her, but im not sure. Check her thread
REX - DEZTROYA, just list it as "DEZTROYAs Umbreon"
Arren - Arren, just list it as "Arren's Scyther"
JULIAN - KingOldBoy, list it as KingOldBoy's Chimchar
Alez - Alexa888 just list it as Alexa888s Zapdos
Jasmine - Califa, list it as Califa's Kabuto
MattJ - MattJ list it as MattJs slowpoke (the Mew belongs to him as well)
Newts, Stavros - Same as all the above :P
TRELLIS - Darkchaos, list as Darkchaos's Pinsir