What the hey, I'll do some full League predictions:
Participants
Ash, Trip, Bianca, Stephan, Burgundy, Koharu, League Rival
Round 1 - 1 vs. 1
Ash vs. RT
Pikachu vs. Sigilyph (Pikachu)
Round 2 - 3 vs. 3
Ash vs. Koharu
Scraggy vs. Gothita (Scraggy)
Scraggy vs. Mandibuzz (Mandibuzz)
Unfezant vs. Mandibuzz (Unfezant)
Unfezant vs. Scolipede (Scolipede)
Krookodile vs. Scolipede (Krookodile)
Round 3 - 3 vs. 3
Ash vs. Burgundy
Palpitoad vs. Samurott (Draw)
Pignite vs. Purrloin (Pignite)
Pignite vs. Gothitelle (Gothitelle)
Leavanny vs. Gothitelle (Leavanny)
Round 4 - 3 vs. 3
Bianca vs. Stephan
Cinccino vs. Zebstrika (Cinccino)
Cinccino vs. Darmanitan (Darmanitan)
Reuniclus vs. Darmanitan (Darmanitan)
Emboar vs. Darmanitan (Emboar)
Emboar vs. Sawk (Emboar)
Round 5 - 6 vs. 6
Prediction 1: Ash vs. Bianca
Palpitoad vs. Cinccino (Palpitoad)
Palpitoad vs. Escavalier (Palpitoad is recalled)
Pikachu vs. Escavalier (Pikachu and recalled)
Leavanny vs. Lilligant (Leavanny)
Leavanny vs. Garbodor (Garbodor)
Krookodile vs. Garbodor (Garbodor and recalled)
Palpitoad vs. Reuniclus (Reuniclus)
Oshawott vs. Reuniclus (Oshawott and recalled)
Pikachu vs. Garbodor (Draw)
Oshawott vs. Emboar (Emboar)
Scraggy vs. Emboar (Scraggy)
Prediction 2: Trip vs. Bianca
Vanilluxe vs. Cinccino (Vanilluxe)
Vanilluxe vs. Escavalier (Vanilluxe is recalled)
Galvantula vs. Escavalier (Galvantula and recalled)
Serperior vs. Lilligant (Serperior)
Serperior vs. Garbodor (Serperior is recalled)
Unfezant vs. Garbodor (Garbodor)
Galvantula vs. Garbodor (Garbodor and recalled)
Vanilluxe vs. Reuniclus (Reuniclus)
Chandelure vs. Reuniclus (Chandelure)
Chandelure vs. Garbodor (Chandelure)
Chandelure vs. Emboar (Emboar)
Conkeldurr vs. Emboar (Draw, Trip wins because he still has Serperior)
Round 6 - 6 vs. 6
Ash vs. Trip
Servine vs. Serperior (Servine is recalled)
Pikachu vs. Serperior (Pikachu and recalled)
Pignite vs. Galvantula (Galvantula)
Servine vs. Galvantula (Servine)
Servine vs. Volcarona (Servine is recalled)
Pikachu vs. Volcarona (Volcarona)
Unfezant vs. Volcarona (Volcarona is recalled)
Unfezant vs. Unfezant (Ash's)
Unfezant vs. Conkeldurr (Conkeldurr)
Gigalith vs. Conkeldurr (Gigalith and recalled)
Oshawott vs. Volcarona (Oshawott)
Oshawott vs. Jellicent (Jellicent)
Gigalith vs. Jellicent (Jellicent)
Servine vs. Jellicent (Servine)
Final Round
Ash vs. League-Only Rival
Scraggy vs. Scrafty (Scrafty)
Pignite vs. Scrafty (Pignite)
Pignite vs. Eelektross (Pignite is recalled)
Krookodile vs. Eelektross (Krookodile)
Krookodile vs. Ferrothorn (Krookodile)
Krookodile vs. Golurk (Golurk)
Servine vs. Golurk (Servine)
Servine vs. Braviary (Braviary)
Pikachu vs. Braviary (Pikachu and recalled)
Pignite vs. Victini (Victini)
Oshawott vs. Victini (Victini)
Pikachu vs. Victini (Victini)
Obviously, the last one is just a random guess. Heck, most of it is just a random guess. But it's a fun random guess. One thing that I didn't type that I could see happening is Trip fighting and beating Bianca rather than Ash.
Also, for those who haven't seen, the entire outcome of the Donamite tournament is now known, except for the champion. Here it is, if you're curious:
Round 1
Edmond vs. Stephan: Seismitoad vs. Sawk (Sawk)
Flora vs. Cilan: Gothorita vs. Pansage (Pansage)
Akkie vs. Ash: Simisage vs. Scraggy (Scraggy learns Focus Blast and wins)
Iris vs. Burgundy: Excadrill vs. Dewott (Excadrill)
Pakkie vs. Chakkie: Simipour vs. Simisear (Simipour)
Grace vs. Georgia: Druddigon vs. Bisharp (Bisharp)
Masaomi vs. Domon: Throh vs. Mienshao (Throh)
Trip vs. Bianca: Conkeldurr vs. Emboar (Emboar)
Round 2
Ash vs. Pakkie: Scraggy vs. Simipour (Scraggy)
Iris vs. Masaomi: Excadrill vs. Throh (Throh)
Georgia vs. Bianca: Bisharp vs. Emboar (Emboar)
Stephan vs. Cilan: Sawk vs. Pansage (Sawk)
Round 3
Ash vs. Masaomi: Scraggy vs. Throh (Throh)
Stephan vs. Bianca: Sawk vs. Emboar (Sawk)
Final Round
Masaomi vs. Stephan: Throh vs. Sawk (???)
On a semi-related note, does anyone here know how to include spoiler tags in this new layout?