So this is may be hella controversial but idk
I feel like the Teambuilding guide in PokeBase isn't the...most fleshed out, or beginner friendly. As a person who basically self-taught myself competitive Pokemon, I know what things newbies should know when they're just starting out. That being said, when I was looking at the new RMT rules (great job Fizz), I can't help but think that new players aren't going to give a crap about "Teambuilding". The link that Teambuilding 101 sends you to is very long as it is compressed with other "Read before posting" rules, most likely making new players/users bored and say "fck it we ball".
The actual Teambuilding section itself is also very plain. Sure, you mentioned formats, EVs, IVs, and Smogon, but it is very unlikely that a new player would understand everything. As much as I love Smogon, it's main page is quite badly formatted, and I feel like it is geared towards veterans who know what they are doing (case in point, the first thing I did when I saw Smogon was to look at my favorite Pokemon in Strategy Dex and be like "oo this cool i forget all in 2 seconds"). Smogon guides in particular (like the EV guide) jump into the fray of things with damage calcs and Pokemon that beginners have no idea about, making them more advanced guides. I feel like DB is more geared towards beginner competitive players due to its more straightfoward layout and popularity, so we should probably have some more beginner-friendly guides. Believe me, I tried teaching a few people competitive Pokemon (and a few still play today) and I had to go through a ton more than basic guides online.
As to how this can be fixed, I feel like we (or one of us, I don't mind depending on how much time I have) should try and revamp the Teambuilding 101. With basic knowledge of game mechanics (like the PhysSpec split, that took me a year to realize it existed), we could then direct them to Smogon and more advanced guides/competitive communities. I understand if no one supports this idea, as we are not a community geared towards competitive Pokemon. However, as one of the most popular Pokemon sites and already having established a RMT section, I think it may best for new users to at least have a basic understanding of something.
TLDR: I think the Teambuilding 101 section is a little barebones, and the advanced guides it links to are all too complicated for a beginner player to understand and get him interested. As a popular Pokemon site, having a more basic guide could be beneficial for all the new players, especially those in RMT who are just excited to try out competitive but have no idea what to do.
I just wanted to watch out for me 5 years ago who ran Mixed Charizard X and evened out all his stats, all the while thinking he was the best player ever
Also having 3 consecutive (maybe even more) posts in RMT just shut down, potentially bc guides are too complicated and uninteresting, is just painful to me