Onix evolves into Steelix when traded while holding a Metal Coat. This evolution process was introduced in Generation II of the Pokémon games. Once Onix is traded with a Metal Coat, it will evolve into Steelix, a Steel/Ground-type Pokémon with increased stats and a different appearance. **

In Pokémon Gold, you can evolve Onix into Steelix by trading it while holding a Metal Coat. Once you have a Metal Coat in your inventory, initiate a trade with another player or use a second Game Boy to trade with yourself. During the trade, Onix will evolve into Steelix. Keep in mind that Steelix will only evolve from Onix if it is holding the Metal Coat during the trade process. **

The traded Onix in Pokémon Crystal is stubborn because it has a high level of friendship with its original trainer, making it less likely to obey a new trainer. This is a common trait among traded Pokémon in the game, as they may not have the same level of trust and bond with their new trainer. To improve the Onix's obedience, the player can increase its friendship level by spending time with it, using it in battles, and giving it items like vitamins or grooming tools. **

Playing against a grandmaster in chess can be an incredibly challenging and intimidating experience. Grandmasters are among the best players in the world, with a deep understanding of the game and exceptional strategic skills. It is important to approach the game with humility and a willingness to learn, as playing against a grandmaster can provide valuable insights and opportunities for improvement. While the odds of winning may be slim, the experience of facing off against a grandmaster can be a valuable learning opportunity and a memorable experience for any chess enthusiast. **

Becoming a chess grandmaster is a highly challenging and competitive endeavor that requires exceptional skill, dedication, and strategic thinking. While it is theoretically possible for anyone to become a grandmaster with enough practice and commitment, the reality is that only a very small percentage of chess players ever achieve this prestigious title. To become a grandmaster, one must typically start playing chess at a young age, receive expert coaching, participate in numerous tournaments, and consistently perform at a high level against top competition. It is important to set realistic goals and enjoy the journey of improving your chess skills, regardless of whether or not you ultimately reach the grandmaster level. **

To checkmate in chess, you need to put your opponent's king in a position where it is under attack and cannot escape capture. This means the king is in a position to be captured on the next move and there are no other legal moves available to get out of check. Checkmate ends the game immediately, and the player who achieves checkmate is declared the winner. It requires strategic planning, positioning your pieces effectively, and anticipating your opponent's moves to successfully checkmate in chess. **

To checkmate in chess, you need to put your opponent's king in a position where it is under attack and cannot escape capture. This means the king is in a position to be captured on the next move and there are no legal moves that can be made to prevent this. To achieve checkmate, you must use your pieces strategically to control key squares around the opponent's king and limit its movement until it is trapped. It is important to plan your moves carefully and anticipate your opponent's responses to successfully checkmate in chess. **

No, I have never played against a chess grandmaster. As a language model AI, I do not have the ability to play chess or any other games. However, playing against a grandmaster would be a challenging and exciting experience, as they are highly skilled and knowledgeable in the game of chess. **