The Battle Pyramid, is a place of wonder and problems

In here, you enter with 3 Pokémon. Your bag gets taken and replaced with the Battle Pyramid Bag to limit your Items
You get sent into Maze after Maze which include Trainers and Wild Pokémon at very high levels. No you cannot catch them, they took your bag remember. You will find more items such as Potions, Antidotes, Revives & Berries Scattered about!
Whenever you beat a Wild Pokémon or a Trainer, your view gets increased making it easier to search for the blue Warp Tile to get you to the next Level.
There are 7 Floors In Each Round and your task is to get to the top without losing all of your Pokémon. The difficulty increases each go through

Here are the rules: No Legendaries Lv. 50 or Any Level The Level in Any Level matches your top Pokémon Level

At the end of your 21st Floor you get challenged by the Pyramid Leader. Beat him and you shall get the Silver Battle Pyramid Badge:

Pyramid King Brandon	Regirock	Regice	Registeel

At the end of your 70th Floor (Through it 10 times) you get challenged by the Pyramid Leader. Beat him and you shall get the Gold Battle Pyramid Badge:

Pyramid King Brandon	Articuno	Zapdos	Moltres

Pick Up

Since you cannot enter Pokémon with Hold Items into the Battle Pyramid, you may be wondering about the PickUpness in the Battle Pyramid. If you didnt know, PickUp is an Ability that randomly picks an item up and attached it to your Pokémon. The Below Pokémon are the ones that have this ability:

However, unlike normally, it is not determined by levels...it's determined by consecutive floor number. You can detach them from your Pokémon, but whenever you leave the Pyramid, it's removed and you don't keep it. Below is a list of the Pyramid PickUp Items:

Floor	Common	Uncommon					Rare
0 - 6
7 - 13
14 - 20
21 - 27
28 - 34
35 - 41
42 - 48
49 - 55
56 - 62
63 - 69
70 - 76
77 - 83
84 - 90
91 - 97
98 - 104
105 - 111
112 - 118
119 - 125
126 - 132
133 Onwards