Welcome to The Never Ending Cheat 1st Gen Pokemon Games Edition. Don't be stupid enough to try these cheat because they are 100% FAKE!!!
In the first battle with Gary challenge him with 4 lvl3 weedles a Kakuna lvl5 and your starter. Then rapidly tap A until he sends out a Spongebob level 255. You shouldn't die because all he can use is Bubble and his Health is 1 and his Sp Atk and Attack are only 1 Now... (Next person)