The Ceaseless Strategy
With this strategy, you could get sub 3 on any of the Obtain Power Up subcategories.
The Strategy: When spawning in a new game that has an open layout you directly spam the space bar so a bomb appears. Then directly start moving towards the middle along the border to the nearest bush, run away from the beam that will eventually come from the spawned in bomb. Run to a spot where you can easily pick up the powerup that will appear from the bush.
Runs that have done this: Ceaseless: https://www.speedrun.com/bombermanscratch/run/mk87o6xm https://www.speedrun.com/bombermanscratch/run/yj6l0kgz WhatsFrog: https://www.speedrun.com/bombermanscratch/run/m78pdr9z https://www.speedrun.com/bombermanscratch/run/yw0pqn0m
Extra Notes: This is the best-done strategy while it's possible to get sub 0.3 that takes incredible RNG and help from random players who you cant communicate with