Have you guys noticed how the Medium Slow EXP Group is actually top tier when beating the game?

>requires the least total EXP of all the groups to get from level 1 to level 29 with only 19,411 (Fast requires 19,511 and outpaces Medium Slow only after this point)
>even at level 45, Medium Slow still needs less EXP than Medium Fast to gain a level (6,188 vs. 6,211)
>Erratic, the fastest group to get to 100 outpaces Medium Slow in total EXP as late as level 55 (158,056 vs. 159,635)
>Medium Fast only outpaces Medium Slow in total EXP way too late for the main story at level 68 (314,432 vs. 314,618)

Basically, Medium Slow is lightning fast for the first 30 levels and is still pretty good later while Fast is linear and quick, Medium Fast is linear and average, and Slow is linear and slow.
Fluctuating starts out like Medium Slow but becomes complete shit later, Erratic is an absolute nightmare early but is the fastest to reach 100.

Medium Slow also contains many of the ingame powerhouse lines such as Nidoran, Abra, Machop, Geodude, Gastly, Mareep, Starly, Timburr, Sandile and all the starters. Medium Slow is one of the reasons why they are so dominant during the main story and especially in the early game.