Added tutorial

Faster-HP-Drain.md

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+## Faster HP Drain
+
+From GSC till Gen 4, GF has made an error that caused the HP drain for max values over 48HP to drain slower than intended. For GSC-DPP/HGSS, the bar drains at a set increment, regardless the max HP of the pokemon. As expected, it'll be slow the larger the HP (like Blissey)
+
+We can fix this by making it use the Mon's Max HP value in a fraction formula instead of being a set value!
+
+Note: Effects won't occur unless a Pokemon has 48 HP or higher for Max HP. For mons lower than 48 HP, the speed is just 1
+
+In [src/battle_interface.c](../blob/master/src/battle_interface.c) , around Line 2220
+```diff
+    if (whichBar == HEALTH_BAR) // health bar
+    {
+        currentBarValue = CalcNewBarValue(gBattleSpritesDataPtr->battleBars[battlerId].maxValue,
+                    gBattleSpritesDataPtr->battleBars[battlerId].oldValue,
+                    gBattleSpritesDataPtr->battleBars[battlerId].receivedValue,
+                    &gBattleSpritesDataPtr->battleBars[battlerId].currValue,
+-                    B_HEALTHBAR_PIXELS / 8, 1);
++                    B_HEALTHBAR_PIXELS / 8, gBattleSpritesDataPtr->battleBars[battlerId].maxValue / x);
+```
+With [x] being whatever value you want
+
+Now let's define what this does
+
+This takes the specified battler's Max HP, and uses that to divide by a specific value. To have it _most_ like vanilla, x can be 48, though we can go faster
+The smaller the x value, the faster it'll go. The larger the Max HP, the faster it'll go!
+
+Here's what I personally use, a value of 32 for x
+We can see the results for the tanky beast like a post lvl 50 Mewtwo
+
+![](https://cdn.discordapp.com/attachments/353690918597033984/813580261920210964/e.gif)
+
+Experiment for the right speed you want, and enjoy!