RULES FOR EVOLVING/CHANGING A STARTER
1. After achieving the Rank of a Captain (10 Posts) you can either Evolve your Starter or change it with any other Electric Pokemon till Gen VII (EXCEPT LEGENDARIES/MEGAS/ALOLAN FORMS).
2. After achieving the Rank of a Major (20 Posts), you can Evolve your Starter to the 3rd Stage (if it has a 3-Stage Evolution) or change your Starter/Partner with any other Electric Pokemon till Gen VII (EXCEPT LEGENDARIES/MEGAS/ALOLAN FORMS). This is also the LAST TIME, you can Change/Evolve your Partner.
BONUS PARTNERS
1. After achieving the Rank of a Captain (10 Posts), you not only get to Evolve/Change your Starter, but also get to choose another Pokemon from the "Available Starters" List. This Pokemon can be Evolved/Changed, after achieving the Rank of Major (20 Posts). If it has a 3-Stage Evolution, you can choose to Evolve it to its Third Stage, any time you like, but you CANNOT CHANGE it with any other Pokemon.
2. After achieving the Rank of a Colonel (30 Posts), you get to choose TWO more Pokemon for your Team. These Pokemon can be any Electric Pokemon till Gen VII, including 2nd & 3rd Stage Evolutions (but NOT LEGENDARIES/MEGAS). If its a Basic Stage Pokemon (from the "Available Starters" list) & has a 2-Stage/3-Stage Evolution, you can choose to Evolve it to its Second/Third Stage, any time you like, but you CANNOT CHANGE it with any other Pokemon. And u can choose Alolan Forms as well, from now on.
MORE TEAM MEMBERS
Once you achieve the Rank of a General (75 Posts), you can add yet another Pokemon to your team. This can be ANY Pokemon, including Legendaries, Mega Evos, Alolan Forms.
For every 25 Posts after that, u can keep adding One more Pokemon to your team.