When your about to face reshef and Sol Chevalsky, go to the room where the path splits forward, left, and right. If you go left, you will come to a room that has a big picture of Shadi. If you press A on the picture, Shadi will appear and start talking. You do not have to do this, but it tells you a lot more about what happened in the game.
After beating Marik, you will come into the Paradox challenge. Here you will fight 5 duelists one after the other. You have to win to move to the next duelist but every time you beat them they give you a card. Beat the first 4 guys and they will give you kuriboh, time wizard, celtic guardian, and giant soldier of stone.Then lose to the next guy purposefully, and beat the 4 first guys again, etc. Then you can sell the bad cards, and sell or keep the good ones. After you are satisfied beat all 5 duelists.
Each monster has an alignment. If your monster's alignment beats your opponent's monster's alignment, you can automaticly destroy it, regardless of attack/defense points. There are two circles of alignments (there's an align. Then ---+ then another align. It means the first align. Beats the second align. Ex. Purple ---+ blue means purple beats blue):
I Haven't tried all of these and most will need Ra to be on the field to work but I will Label the ones I have used with an asterisk just so you know for certain which ones do work.
NO TRIBUTE SUMMON* When You have the phoenix mode (there was a hint about how to get it earlier in this section) and it is in your hand simply but you do not have enough monsters to summon it press B select Discard and you will activate it's special ability and bring it's battle mode onto the field
EFFECT THEN ATTACK* If you have phoenix mode on the field use it's Effect (raigeki for 1000LP cost) then discard it to bring the battle mode out then attack on that same turn to deal out a huge 4000 LP to your opponent directly
ATTACK THEN EFFECT If you have phoenix on the field and (for whatever reason) your opponent has no monsters on the field attack with phoenix mode then discard and use the battle modes effect ( Drop own LP to 1 then make opponent lose same) to deal out up to 12000 LP damage (or more depending on your own LP if you've used lots of healing cards) for any almost guaranteed instant victory. Although this is an extremely powerful move I would advise against using it against Reshef as he is likely to use a direct attack of some kind.
DOUBLE EFFECT If you have Phoenix on the field use its Raigeki type effect then discard it to bring out battle mode and use the battle modes effect ( actually if you think about it that is a Triple effect-Raigeki,Summon Battle Mode then Direct attack)
DOUBLE ATTACK If you have phoenix mode out and your opponent has no monsters on the field attack twice (once with both modes). This is advised if you have less than 4000 LP The effect of the battle mode is advised if you have more than 4000 LP
For this to work, you'll need to find a way to get an egyptian god card(oblisk,ra,slifer) no matter which one it will work, on the field. Also have final destiny in your deck and if your lucky enough, you'll get it when the god is on the field. Activate final destiny and direct attack your opponent with the ultimate force!!!!!!!!!!!!!!!!!!!!!! This worked for me, I had slifer on the field and activated final destiny and dealed 4000 lp to my opponent(Marik).