In some areas of the D/P/P boards (Wireless Battle Stadium, and Wireless Trade Corner), as well as in the visitor messages, it is allowed to use "fillers" to bypass the 25 characters and four words rule set in all the forums, mainly because posts there don't add to the total, and meetings for trades (one example) can be easily solved with a "Ok", so having to write 25 characters may be somewhat unnecessary in that case.
This said, the usage of "fillers" (random words unrelated to the post) is NOT allowed anywhere else in the forums, to prevent spam. So, if you see a post using fillers outside of the previously said areas, please report it.
I think this is what you were asking, wasn't it?