Elbow it in the gut.

Before it can get to you, you move your arm and shove your elbow straight into the attacker's stomach.

The pikachu flies a few feet away attempting to get up and try again.

Just then, you hear a voice, "Don't worry child; I'll save you!" You turn to see the pokemon professor Oak standing in a battle stance. He tosses an orb he was carrying in his hand over to the pikachu. You watch as the red and white ball bonces off the pikachu and engulfs it in a beam of white light. The professor has a tense look on his face as the ball falls to the ground and begins to shake...once...twice...thrice...bing! Professor Oak then sighs in relief, "I'll be honest, I didn't think I could capture him with just an ordinary pokeball. I got really lucky there." He then walks over to the ball and presses the white button on the front of the device. This causes it to shrink allowing him to place it in his inside coat pocket.

He looks over at you with an outstretched hand. "You know, you really shouldn't be out here if you don't know what you're doing." You take his hand and he helps pull you up on your feet. "You're that Red kid right? The one who should've gone to my lab toady?" You turn your head somewhat embarassed by the accusation. "Don't worry. You'll be fine in this place once you have your own pokemon to start out with, come!" He begins to walk back into Pallet Town as you follow his lead.

He brings you over to his lab, where you enter, feeling a nice, air conditioned breeze hit you. He walks on ahead to the back of the room filled with various men in labcoats and data machines far too complicated for any one person to understand.

Following him to the back, you see Professor Oak standing with his back against the wall. To the left there is a small desk with a PC, presumably belonging the the professor, and two encyclopedia-like tools, and to the left there is a large bookshelf with a trash bin beside it. In front of that is a large table with only a single thing on it: a device similar to the one used before to capture the pikachu. Next to the desk, you see Blue looking annoyed as you walk up to Professor Oak.

"Come on, gramps! When are you gonna give me that new pokemon you promised?"

"Oh, Blue! I forgot you were here. You will just have to wait for a bit; I'll deal with Red first."

"Uh...I have to wait forever...."

"Now Red, every trainer needs to begin his journey with a pokemon he can begin his adventure with! Both of you will grow on your quest to become a pokemon champion. Now, take the pokemon in that ball on the table."

"What! Why does she get it?"

"Because that is the one I reserved for her. You'll get yours in a bit."

You walk over to the ball, right before you could take it, however, Blue rushes in, pushes you to the side and takes the device.

"Blue! What are you doing?!"

"I wanted the pokemon gramps! You promised me one, so I should get one, since I'm your grandson!"

"Oh...Oh, alright, you can keep that one. Red, come over here!"

As you walk toward the professor, you give a mean look to Blue. Once in front of Oak, he reaches in his coat pocket and pulls out another pokeball. "This is the one I caught earlier today. I know it isn't what I reserved for you, but you can still do great things with this one."

"Hm...what's that? Not a good idea? No, no, it's fine; once you catch a pokemon, it will become more respective towards you!"
"By the way, would you like to name your first pokemon?"
"Charmy eh? That's a wonderful name!"

"Now both of you, go on and enjoy your adventure."

You put the small ball into your pouch.