A Professor Oak challenge is where you catch all available Pokémon before moving on to the next story event. I have not found a guide for this game, so this page may be the first. Please contact me if you know of an existing guide or know of inaccuracies in this guide.
A total of 270 Pokémon can be obtained in this game, including the three accessible in Ranger Net missions.
Total: 4 Pokémon
Total: 6 Pokémon
Total: 7 Pokémon
Total: 9 Pokémon
Total: 10 Pokémon
Total: 11 Pokémon
Total: 12 Pokémon
Total: 13 Pokémon
Total: 15 Pokémon
Total: 19 Pokémon
This catch is part of the Quest Calm Down Miltank.
Total: 20 Pokémon
Total: 31 Pokémon
Total: 32 Pokémon
Total: 43 Pokémon
Total: 44 Pokémon
This catch is part of the Quest Please Save Cranidos.
Total: 45 Pokémon
Total: 48 Pokémon
Total: 53 Pokémon
Total: 60 Pokémon
This catch is part of the Quest The Boy Who Cried Lumineon.
Total: 61 Pokémon
This catch is part of the Quest Eevee for Marital Bliss.
Total: 62 Pokémon
Total: 72 Pokémon
Total: 73 Pokémon
This catch is part of the Quest Please Save Turtwig.
Total: 74 Pokémon
This catch is part of the Quest Who Ate My Lunch?!.
Total: 75 Pokémon
Total: 77 Pokémon
Total: 90 Pokémon
Total: 103 Pokémon
Total: 104 Pokémon
Total: 105 Pokémon
This catch is part of the Quest Please Save Shieldon.
Total: 106 Pokémon
Total: 114 Pokémon
Total: 121 Pokémon
Total: 131 Pokémon
This catch is part of the Quest Apologies to Vespiquen.
Total: 132 Pokémon
This catch is part of the Quest Please Save Chimchar.
Total: 133 Pokémon
Except for Floatzel, these catches require traversing the river with Floatzel's River Flow x1 to access new parts of the forest.
Total: 137 Pokémon
Total: 145 Pokémon
Total: 148 Pokémon
Total: 152 Pokémon
Total: 163 Pokémon
After catching Mismagius, you now have access to Psy Power x3, which is required to open a door in Chroma Ruins. Returning back there at this time gives access to:
Total: 164 Pokémon
After this, return to Almia Castle to complete the mission.
Total: 167 Pokémon
This catch is part of the Quest Please Save Piplup.
Total: 168 Pokémon
Total: 177 Pokémon
After catching Aggron, you now have access to Tackle x4, which is required to awaken Torterra in Vien Forest. Returning back there at this time gives access to:
Total: 178 Pokémon
After this, return to Volcano Cave to complete the mission.
Total: 180 Pokémon
This catch is part of the Quest Snover's Mysterious Presence.
Total: 181 Pokémon