I got a ShedNinja when my Nincada evolved into Ninjask. No matter what..

You cannot. The single hit point of shedinja is it's trademark. Its ability (wonder guard) makes it so that only super effective attacks will damage and instantly kill shedinja. His type is bug/ghost so only a few types of attacks will actually hit it. The downside is that other thing can kill it such as poison, sandstorm/hail, spikes or burn to name a few. So one needs to be careful with it.

You can't make it's HP go higher thst's just how it is but not very many attacks can effect Shedninja but stuff like poison, sandstorm, burn, spikes, and hail will faint your Shedninja but other than that Shedninja is really good.

Lol, just so you know, his name is Shedinja. But, that does not really matter. I hate to tell you this, but, unfortunately, you cannot increase Shedinja's Health Points. His health will stay at 1 no matter what you do. You can level him up, you can give him items, or anything else that you can think of, but none of it will have any effect. I think it is the price that he has to pay for having his ability protect him from almost every type of attack there is. So, sorry, but, there will be no getting his HP any higher than One.

Hope this helps.

The Others Are Right There Is NO Increasing Shedinja's HP The only Thing You can do is hope that your Pokemon wont faint to anything and focus on defeating the opponent

You cannot increase Shedinja's HP. It's ability allows it to have the ability to only be attacked by it's super effective types (fire, etc.). Because of that, Shedinja HP will only stand at 1. No items or level up's can increase it's HP.

Hope I helped,
Sk8rboy

You can't, but only super effective moves can hurt it, but, there are quite a few it's weak against, really it's just there as a novelty, with no real use, if you do wanna raise it, fight agains normal types

You can't it only has one hp no matter what level you train it up but one good thing is only super effective moves work on him