After Mega Evolving from Rayquaza, Mega Rayquaza has several noticeable differences that set it apart. Its mouth now has some noticeable teeth, with black, jagged sword-like patterns extending from its eyes down its neck. Around its head are multiple protrusions with fiery, tail-like growths at their tips. A pattern of four figure-eight-like sections are on the lower pair of these protrusions, which extend from both sides of the triangle-like extension next to Mega Rayquaza's jaw. Those figure-eights would fit perfectly next to the many gems that are on Mega Rayquaza's body, with each set equidistant from each other. Miniature wing-like growths are also present in three different parts of Mega Rayquaza's body. Its tail also appears to have tendrils of some sort growing from near the main tip.
Rayquaza - Know Dragon Ascent move
The Pokémon changes the weather to eliminate all of the Flying type’s weaknesses.
If the Pokémon has 100% HP, you have 0.4% chances of capture
EVs
Status
0
105
2
180
0
100
1
180
0
100
0
115
0
0
LV. 50
LV. 100
165 - 212
320 - 414
166 - 209
328 - 413
94 - 136
184 - 269
166 - 208
328 - 413
94 - 136
184 - 269
108 - 150
211 - 296
LV. 50
LV. 100
165 - 212
320 - 414
185 - 232
365 - 459
105 - 152
205 - 299
185 - 232
365 - 459
105 - 152
205 - 299
120 - 167
235 - 329
LV. 50
LV. 100
165 - 212
320 - 414
203 - 255
402 - 505
115 - 167
225 - 328
203 - 255
401 - 505
115 - 167
225 - 328
132 - 183
258 - 361