So i beat the game today, and i have seen numerus post about the pit of 100 trials and i have yet to find it but would really like to complete it. Can anyone help me out as to what/where i need to do/go in order to do this? I hear that you need tippie in order to get to it and obviously i dont have her anymore.

Heard that i could get a robot one from the Geek Lizard for 999 coins. Can i do the flipside one without her though? Thanks for any help in advance.

yeah you did need tippi to reveal the blocks to jump on to get it. it's in the basements of both flipside and flopside.
now that you dont have tippi, you can ues luigi to jumponto the cream colored platform somewhere down there, flip to 3d, go down the tunnel and hit a block and it will open the way.

(sorry if its kind of vague, i havent played it in awhile)