Question

I mean for it to stay outside its Pokeball?

Comments

Hmm interesting question!

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You mean to walk with you in HeartGold/SoulSilver? I wondered that myself before I lost my HG, my Rayquaza couldn't follow me into buildings, but I think Latias could.

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Thanks for editing.

Answer 1

Well, while I cannot give you the maximum Height for a Pokemon to enter a building, I can give you the Tallest Pokemon that can enter a building which is:

Gyarados

Gyarados is approximately 21'04'' in height, which is 6.5 M in those of you in the Metric System. Anything shorter than Gyarados can fit in a building no problem, except for certain Legendary Pokemon for some odd reason. Here is is the Link that that shows the Heights of each Pokemon:

http://bulbapedia.bulbagarden.net/wiki/List_of_Pok%C3%A9mon_by_height

Source-
Tested on Pokemon HG

Comments

Good Answer:)

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Credit to Mew for finding the Legendary edit.

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thanks for the effort for the answer :)

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what about dialga?
its big

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???????