I want to thank everyone for providing feedback and commenting which Pokemon they would like to see on Alex's team.
I have finalised Alex's list of Pokemon after taking all the input into consideration. I will remove the mentions of Mantine in the previous chapter after posting Chapter 6. He will capture more Pokemon in the future but for now this is it, unless someone has a very compelling reason why some pokemon should not be on the list.
Alex:
[1] Kingdra
[2] Milotic
[3] Blastoise
[4] Swampert
[5] Gyarados
[6] Vaporeon
[7] Lapras
[8] Starmie
[9] Gardevior
[10] Lanturn
[11] Azumarill
[12] Toxapex
[13] Jellicent
[14] Poliwrath
[15] Empoleon
[16] Dragalge
Although only Gen I-IV pokemon are widely available, I am taking advantage of the fact that the oceans have no boundary and thus Pokemon which live in the deep ocean or can travel across the ocean floor can be captured during diving excursions.